Which question is being asked in this story problem?

Gil's mom bought him 3 toy tractors at a garage sale. Gil already had 4 toy tractors at home. Each tractor has 6 tires.

How many tractor tires does Gil have altogether?

A.
How many tires are on one tractor?

B.
What is the total number of tires on all of Gil's tractors?

C.
How many tractors does Gil have in all?

D.
How many tractors were at the garage sale?