Simple sentence with understood subject.
I believe it’s “People should not fear space weather because violent events are rare and space is vast” because the paragraph wants to convince you that space weather shouldn’t be one of things you should be worrying about.
Answer:
must've
Explanation:
Must've is a contraction of must-have, which is the only acceptable answer. "Must of" is always incorrect, and "must" doesn't include the preposition.
I want to say B. Maintenance, Installation, and Repair.
I hope i am correct.