The subjects of this sentence are 'moose' and 'elk'. So the correct answers are A and D.
Answer: D. The conflict in the plot exists at different levels. In most cases, the writer does not invent conflicts, but takes them from the primary reality-so the conflict passes from life itself to develop of the plot events. This is a conflict at a meaningful level (sometimes it is used to refer to another term, "collisio"). The meaningful conflict is embodied, as a rule, in the confrontation of characters and in the movement of the plot events.
Idiom.....................................
There is no passage and answer choices, so it is impossible to answer this question. I apologise.