His unscrupulous pursuit of wealth finally landed him in prison.

The correct answer is A. superfluous.

The word “superfluous” means “more than is necessary or useful.” In this case, the speaker is saying that the man’s pursuit of wealth was not necessary or useful, and it ultimately led to his downfall.

The other options are not correct because they do not accurately describe the man’s pursuit of wealth.

• The word “single-minded” means “having or showing a single aim or purpose.” This does not accurately describe the man’s pursuit of wealth, because he was not focused on a single goal. He was willing to do whatever it took to get rich, even if it meant breaking the law.
• The word “dedicated” means “having or showing a strong commitment to a particular task or purpose.” This does not accurately describe the man’s pursuit of wealth, because he was not committed to anything other than his own personal gain.
• The word “conscientious” means “having or showing a sense of moral duty.” This does not accurately describe the man’s pursuit of wealth, because he was not concerned with doing the right thing. He was only interested in getting rich, even if it meant hurting others.