War as a countable / uncountable noun

Hello everyone. I have a question.

I'm wondering how to use the noun war in a particular case like below. Could you please evaluate each of the three sentences depending on whether or not it is natural?

(A) We must always be reminded that we are faced with risks such as environmental destruction and nuclear war.

(B) We must always be reminded that we are faced with risks such as environmental destruction and a nuclear war.

(C) We must always be reminded that we are faced with risks such as environmental destruction and nuclear wars.