Soporific is an English word which means - cause to sleep. The origin of this word is Latin. It comes from the Latin word sopor - deep sleep.
The verb here is "had given"; this is past perfect: it's a perfect tense, because it has a past participle with the -ed ending ("given") and it's the past perfect because the auxiliary verb is the past form of "have": had.
Answer:
A. In fact, elephants place such huge demands on their own environment, that in order to survive, they often come into conflict, with humans, who are competing for the same resources.
Explanation:
I think this is the answer. The sentence before states that elephants devour several hundred pounds of plant matter in a single day, so this is why i would say "in fact". I'm sorry if this is the wrong answer!