Fill in the blank with the correct preposition.
They ran ________ the thief who had stolen their belongings.

Correct option is B

Correct option: (b) after
Meaning & usage (in detail):
• run after → to chase/pursue someone (Hindi: पीछा करना / दौड़कर पकड़ने की कोशिश करना)
Correct sentence: They ran after the thief who had stolen their belongings.
Grammatical Rule (English):
• “run after” is a fixed verb-preposition combination meaning to chase.
व्याकरणिक नियम (Hindi):
• “run after” एक fixed combination है जिसका अर्थ पीछा करना होता है।
Meanings of other options:
• (a) run from → to escape; भागना (Hindi: से भागना)
• (c) run with → साथ दौड़ना/किसी विचार के साथ आगे बढ़ना (Hindi: के साथ दौड़ना)
• (d) run in → अंदर दौड़कर आना/कभी-कभी “run in” = पकड़कर थाने ले जाना (Hindi: अंदर जाना / पकड़ा जाना)
Hence, option (b) is the correct answer.