That's not a full sentence. "the glacier" is a phrase, not a sentence.
The answer is: D. the presentation usually does not seem over-rehearsed
Answer:
it
Explanation:
It cannot be "them" becasue telephone is singular and them is plural.
It can't be "her" becasue its not a person
It cant be "that" becasue it changes the tense of the sentence
So the only answer left is "it"