The diagram shows the trajectory of three artillery shells. Each was fired with the same initial speed. Which shell was in the air for the longest time? (Ignore air friction.)
[Figure: Three parabolic trajectories labeled A, B, C with different launch angles]
(a) Shell A.
(b) Shell B.
(c) Shell C.
(d) Shells A and C were in the air for equal time, which was longer than for shell B.