This is math, not English, but okay xD
"Two intersecting lines are perpendicular if and only if they form four 90 degree angles" would be my answer.
The correct answer to your question would be... B. Them
Reasoning:
Them, is the students. Even though the actual word students is not mentioned "Them" is referring to that group of people making "them" the indirect object.
I hope this helps!
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i think the answer you are looking for is answer A.
Alaska probably to see a glacier
Answer: Sequence/process (C)
Explanation: assembling a bicycle is a process