Which archaeological site's excavation report by S.R. Rao makes a passing mention of camels.

The question asks which archaeological site's excavation report by S.R. Rao makes a passing mention of camels.

S.R. Rao is well-known for his extensive excavations and reports on the Indus Valley Civilization site of Lothal. His reports on Lothal include various findings, and it is in the context of Lothal that he made a passing mention of camels.

The correct option is (A).

A) Lothal
B) Dholavira
C) Harappa
D) Mohenjo-Daro

The final answer is $\boxed{\text{A}}$