I agree with Chris: Q1: option 2. Q2: option 1. In both cases, I picked an answer quickly and was pretty sure about it--but find it hard to explain why. In question 1, option 1 might be just plain incorrect; but I think it is possible that it could be a correct but awkward way to express an unlikely meaning. I can concoct an example in which something like option 1 would be correct. "...asking that a serious effort be made, not to stop all commercial development in the area, but to save the plant. In any case, option 2 is definitely correct, while option 1 is probably incorrect, so, as an experienced test-taker, I know what to do. In question 2, option 1 makes sense and option 2 doesn't. I can't even figure out a meaning for option 2. Option 1 might be easier to understand if we order the sentence, "Their protests, using irreverent wit and satire, have motivated many people to consider choosing a career in an artistic field." That makes sense, and "Their protests, for use of irreverent wit and satire," doesn't--unless it means that the protesters are protesting _somebody else's_ satire. We might use the phrase "for use of irreverent wit and satire" in a sentence like this: "The autocratic government threw the protesters in jail for use of irreverent wit and satire." We could also use this word order, "For use of irreverent wit and satire, the autocratic government threw the protesters in jail."

1. Option 2 is correct. "To save the plant" is an infinitive phrase--it's not a complete clause by itself, so it shouldn't be separated with a comma 2. Option 1 is correct.