Fill in the blank in the given sentence by choosing the correct option out of the given ones.
I am happy ______ him ______ helping me.

Correct option is B

Correct option: (b) with; for
Why it is correct (highlight):
• happy with someone = satisfied/pleased with a person (Hindi: किसी से खुश होना)
• for + V-ing = reason/cause (Hindi: के लिए / कारण)
Correct sentence: I am happy with him for helping me.
Grammatical Rule (English):
• “happy with” (person) + “for” (reason/action).
व्याकरणिक नियम (Hindi):
• व्यक्ति के साथ with और कारण/क्रिया के साथ for का प्रयोग सामान्य है।
Why other options are incorrect:
• (a) “happy to him” गलत collocation है।
• (c) order/structure गलत और unnatural है।
• (d) “on; on” गलत pairing है।
Hence, option (b) is the correct answer.