Why do the scientists have to measure the tree kangaroos' necks? A large neck is a sign of good health. B The kangaroos will be fitted with radio collars. C Neck size distinguishes the males from the females. D They are comparing kangaroo necks with human necks.

The correct answer is:

The kangaroos will be fitted with radio collars (B)

Explanation:

Attached to this answer is a screenshot of the comprehension passage: "Quest for the Tree Kangaroo". The passage about a biologist; Lisa Dabek, who sets out to study Tree Kangaroos in Papau, New Guinea, and in the process fit them with radio collars so as to study them and protect them from danger, hence the measuring of the necks of the Tree Kangaroo after they've been captured to determine the size of the radio collars to be fitted on them.

1,2, and 6 are the answers. Hope this helps :)