I would say b and c, since unfasten and clench are basically antonyms and those answers both have antonyms
The Climax is were you see the tensions at its peak.
Answer:
this passage illustrates the planning process of space ship and satellite development .... the expenses, advantages and importance in future
Answer: someone who wants to steal everything you worked for.....
Explanation: FROM GOOGLE: burglar, sniper, pickpocket, bandit, crook, swindler, criminal, pirate, robber, mugger, prowler, clip, cheat, hijacker, punk, plunderer, kleptomaniac, pilferer, larcenist, stealer.
