In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.

Let me give you an example: Jess Mastriani: No, I don't want another crooler, thank you very much.
 FBI Agent Nicole Scott: But it's good for you. It's got... honeyglaze. Please die for this crooler, Jess.
 Jess Mastriani: I've had _ two _ already. Who eats three croolers in a night? 
FBI Agent Nicole Scott: Take a look. [Nicole takes a huge bite] Mmmmm, Mmmmm, Mmmmm!
The answer to this example can be: REFERENCE crooler
Here is why: In this example, the number two refers to something that appears in this text. In this example, it refers to the word: crooler.

OK. solve this:
Austin James:  C'mere . C'mere ! Look at it !
Austin James: That
Austin James: 's all that 's left of Donald Statheim , an aviator , crashed _ 1921 _ while circumnavigating Hudson Bay . Note the object imbedded in the left posterior fontanel . FONTANEL . It 's the point of an icepick . Statheim did n't die in the plane crash ; he died a minute beforehand when someone drove that into his brain . But who did it ? And how ? Those who saw Statheim leave on his last flight , they insist he was alone . And if the murderer was aboard the plane , how was he able to survive the crash , and then trek out of the wilderness ? Nobody knows .
Austin James: I
Austin James: 'm going to solve it ! Motive , method , murder ! And I 'm going to do it using nothing but this skull .
Michelle Castle: You 're crazy ! That 's impossible !
Austin James: Look at it ! The answer 's got to be there ; some infinitesimal bit of minutiae is just screaming it . And all I need to find it is the power of observation .
Answer:
YEAR