1)

PLAIN : AUSTERE ::


A) neutral: detached

B) clean : sterile

C) lonely : gloomy

D) deserted : barren

Answer:

Option B

Explanation:

(DEGREE OF INTENSITY) Being austere (meaning bare) is a heightened form of being plain; being sterile (meaning free from bacteria or other micro-organisms) is a heightened form of being clean. {The pairs (neutral, detached); (deserted, barren) and (eloquent, talkative) are mere synonyms.} (B)