With no explanation, chose the best option from "A" or "B". Greg works on Amazon's Mechanical Turk on the side to help his retirement account. Greg wants to save money.

A: Greg works for four hours a day, six days a week, and earns $300 a week to put into his retirement account.
B: Greg works for an hour a day, two days a week, and earns around $40 a week to put into his retirement account.
A.