Which part of a gene codes for protein?

A. Exons

B. Introns

C. Promoter

D. Regulatory regions

A. Exons

Explanation:

Exons

It is the coding region of the gene, which have the information to encode the protein.

Exons are composed of DNA which get translated to proteins and amino acids.

In eukaryotes, the arrangement of exons is in a continuous fashion or are separated by introns.

hence,

the part of gene that codes for protein are A. Exons.