Suppose a bill arrives on the desk of the president of the united states. it originated in the senate. he decides on a pocket veto. this will be possible for him only if
a. congress is about to adjourn.
b. the house has not passed the senate bill.
c. the house still has the bill in committee.
d. the senate is in recess, but about to convene

This will be possible for him only if "a. Congress is about to adjourn" since otherwise the President has ten days to return a bill to the House without his signature. 

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.