Which sentence is punctuated correctly? A)The students line up in the afternoon to wait, for the buses to arrive.
B)The students, line up in the afternoon, to wait for the buses to arrive.
C)The students line up in the afternoon to wait for the buses to arrive.
D)The students line up in the afternoon, to wait for the buses to arrive.

C) The students line up in the afternoon to wait for the buses to arrive.

Explanation:

When you read the sentences aloud, it makes it easier to tell where there are unnecessary pauses like after "to wait", "in the afternoon", and "the students", so that makes me believe that the statement with no commas is the correct one.

every person should make it a priority to serve at least two hours per week.

it's an extremely important civic responsibility that is invaluable to citizens most in need is the correct one