Correct option is A
The correct synonym of the given word is (a) rainstorm.
Cloud burst: A sudden and extremely heavy downpour, usually localized, that can lead to flash floods. (Hindi: बाद लफटना)
Example: The hilly region experienced a cloud burst, causing landslides and flooding.
Rainstorm: A heavy fall of rain often accompanied by wind or thunder. (Hindi: तेज बारिश)
Example: The picnic was cancelled due to a sudden rainstorm.
Synonyms: downpour, deluge, thunderstorm, rainstorm
Antonyms: drizzle, drought, clear sky, dry spell
Meanings of other options:
· Sandstorm: Windstorm carrying dust/sand (Hindi: रेत तूफ़ान)
· Famine: Scarcity of food (Hindi: अकाल)
· Snowfall: Precipitation of snow (Hindi: हिमपात)