Problem: How does the sentence end?

I went to pour more water from the watercooler into the bottle but the 
OPTIONS:
- watercooler was full.
- bottle was full.
Answer: bottle was full.
sentence: Maria wanted to buy a vinyl table cover to replace her tablecloth. The  OPTIONS:
- tablecloth was old.
- vinyl table cover was old.
complete: tablecloth was old.
The tree gave better overall shade at the picnic than the canopy, because the 
OPTIONS:
- tree was thicker.
- canopy was thicker.
tree was thicker.
Input: Continue writing.

Christine ran and picked up a laser gun before Jessica because 
OPTIONS:
- Christine had spotted the laser gun last.
- Jessica had spotted the laser gun last.

Continued: Jessica had spotted the laser gun last.
Story needs to be completed:
Katrina helped Sarah to lift the picnic table they made together, because 
OPTIONS:
- Katrina is weaker.
- Sarah is weaker.

My choice:
Sarah is weaker.
Problem: How does the sentence end?

Make sure the head office does not see the email you sent last night. The 
OPTIONS:
- email is too unforgiving.
- head office is too unforgiving.
Answer:
head office is too unforgiving.