Bunuel wrote:

How many different carpool possibilities exist for 12 coworkers from the same neighborhood?

(1) Each of the three cars that will be used for carpooling seats exactly 4 people.

(2) If 2 of the coworkers took the day off, there would be fewer carpool possibilities.

CARPOOL MEANING: an arrangement between people to make a regular journey in a single vehicle, typically with each person taking turns to drive the others.Once you understand the meaning it is easy to identify the question.

Stat 1: There are three cars with 4 seats...then out of 12 workers...Since there is no restriction on the workers...

in the first car = 12C4 possibilities..

second car = 12C4

third car = 12C4.... Sufficient.

Stat 2: We don't have enough information about the cars here but we have 10 worker information...Hence insufficient.

IMO option A.