Correct option is C
Part (A): “A thorn from one”
This is grammatically correct. It properly begins the phrase “A thorn from one of the prickly bushes.”
No error here.
Part (B): “of the prickly bushes pushed”
This completes the phrase correctly:
“A thorn from one of the prickly bushes pushed…”
Grammatically correct structure.
No error here.
Part (C): “through the boy’s shoe”
This is correct. A thorn can push through a shoe.
No grammatical issue here.
Part (D): “and into his food”
Here is the problem.
Logically and contextually, a thorn pushing through a shoe would go into his foot, not his food.
“Food” means something eaten.
The correct word should be “foot” (meaning: पैर).
This is a word error (spelling/meaning error affecting sense).
Conclusion
The error is in Part (D).