Correct Answer: Pleasant

Solution : The correct choice is the third option.

Explanation: Repulsive is an adjective used to describe something that causes a strong feeling of disgust or aversion. Its antonym, pleasant, denotes the opposite meaning by representing something that is agreeable, enjoyable, or pleasing. 

The meanings of the other options are as follows:

• Steadfast: It means resolutely or dutifully firm and unwavering. It's an adjective used to describe someone who is committed and reliable.
• Superfluous: it refers to something unnecessary or excessive, exceeding what is sufficient or required.
• Hopeless: It describes a situation or someone who feels despair or lacks hope, lacking the possibility of success or improvement.

Therefore, the correct answer is pleasant.