Desirable

Concept: A synonym question asks for the word closest in meaning to the given word. “Desirable” means worth having, wanted, or pleasing — it belongs to the family of words describing something that brings benefit, gain, or attraction.

Application: “Advantageous” describes something that brings benefit or gain — the same benefit-driven sense as “Desirable,” something worth choosing because it helps you.

Cross-check: Each remaining option belongs to a different semantic family:

• “Inferior” describes lower rank, status, or quality — a shortfall in worth, not a benefit.

• “Unfavourable” describes conditions working against one's interest — an obstacle, not a benefit.

• “Adverse” describes harm or damage — a threat, not a benefit.

Conclusion: Only the benefit/gain sense fits the meaning of “Desirable,” which “Advantageous” carries.