The correct answer is Ill-.
A prefix is a part of a word that you add at the beginning, before the root word, whereas suffixes are added at the ending. The prefix inter- (as in intermediate), means in; the prefix dis- (as in disengage) means away, apart; the prefix en- (as in enable) means to cause something to happen.
Only the prefix ill- has a negative meaning. For example: illegal (the opposite of legal).
1. reusing
2. incineration
3. source reduction
4. recycling
hope this helps! although I do believe it is one of those opinion questions where no answer is wrong.
explanation: I believe that reusing and incineraton are the two best because they are the least wasteful. And while source reduction and recycling are good they aren't quite as efficient as the other two. Plus they are more time consuming.
