63. Health officials estimate that 35 million Africans are in danger of contracting trypanosomiasis, or "African sleeping sickness," a parasitic disease spread by the bites of tsetse flies.

(A) are in danger of contracting

(B) are in danger to contract

(C) have a danger of contracting

(D) are endangered by contraction

(E) have a danger that they will contract

关于A选项，personally, 我认为 contracting 在这里是做形容词，就像frightening news 中frightening一样，指：传染性的，同or后的African sleeping sickness并列，具有名词性意味，作者强调的是病trypanosomiasis，而非传染这个动作。而且在in danger of后面接纯名词性质，更符合of的介宾语法功能

望各位NN确认！

Thanks!

"contracting" is a present participle used as a noun. contracting = getting

Houston Rockets are in danger of losing another game.
in danger of losing - correct
in danger of another game - wrong