Correct option is C
The correct substitution of the highlighted words is (c) wondered whether my.
Explanation: "Feared about" is grammatically incorrect. The correct structure is "wondered whether" when expressing uncertainty.
Correct sentence: I thanked God and wondered whether my school principal would accept my reason...
Grammatical Rule Used:
“Wonder” is followed by if / whether + clause to show doubt or speculation.
Information Booster:
He feared about the result.
He wondered whether the result would be in his favor.