Explanation:

- Cry in the wilderness: This idiom means expressing an opinion or warning that nobody pays attention to. It's like shouting into the void where no one listens.

- Rebuke: This means to criticize or scold someone sharply. It's a form of reprimand but not related to being ignored.

- Confused and lost: This describes someone who doesn't know what to do or doesn't understand the situation. It's unrelated to expressing opinions.

- Aggravate the situation: This means to make a problem worse. It's not about having your voice unheard.

- Unpopular opinion: This option fits best. It reflects having a view that most people might ignore or disagree with.