Question

Jim, “Did you see many whales in the South
Pacific?”:
a) She told Jim if he had seen many whales in the
South Pacific.
b) She asked Jim whether he had seen a lot of
whales in the South Pacific.
c) She asked Jim if he did see a lot of whales in
the South Pacific.
d) She said to Jim whether he saw many whales
in the South Pacific.

Answer 1

b) She asked Jim whether he had seen a lot of

whales in the South Pacific.

because the verb "did" means past. so, the verb "have"  has to be in the past too