“我选修的科目是电子商务”用英文怎么写？

My elective is EC.

elective: 选修科目
这些选修科目使得学生能够修一些他们有兴趣的课程。
These electives allow students to study subjects that interest them.

EC: Electronic Commerce
电子商务还可以是：e-business 或 e-commerce

My major is eCommerce.

I major in electric business

My minor is Electronic Commerce.