Out of the given alternatives given choose the most appropriate option.
He has no doubt ________ it.

Correct option is D

The correct option to fill in the blank is (d) about.
• Explanation:
– The correct preposition with “no doubt” is about, meaning he has no uncertainty regarding “it”.
• Grammatical rule used:
– Certain phrases take specific prepositions – "no doubt about" is a fixed collocation.
• Explanation in Hindi:
– कुछ वाक्यांशों के साथ निश्चित prepositions आते हैं। “no doubt” के साथ “about” का प्रयोग होता है, जिसका अर्थ है “इसके बारे में कोई संदेह नहीं।”
• Example:
– I have no doubt about her honesty. ✅
Meanings of the other options:
• (a) at ❌
– English: Indicates location or point – not suitable.
– Hindi: पर
• (b) on ❌
– English: Indicates surface or topic – incorrect here.
– Hindi: पर
• (c) upon ❌
– English: Formal/archaic form of “on” – not standard with "doubt".
– Hindi: पर