According to the rules for capital letters, names of people should be capitalized. 'Zainul Abedin' is a name, so 'Zainul' should be capitalized. Option d capitalizes 'Zainul'. Options a, b, and c have errors in capitalization for the beginning of a sentence or proper nouns/days.
Class 5 › English For Today › Chapter 4: My Home District › Topic: Language Focus: Use of Capital Letters
Aligned to the NCTB national curriculum.