Let’s find out the answer:
1. The subject pronoun I is used before the verb.
A subject does the action of a verb.
- I went for bowling yesterday.
- I saw a movie last night.
- I ran around the park in the morning.
If you have a double subject, always use and I.
- My friend and I love sweets.
- My father and I enjoy movies.
As we have a double subject in the question above, the correct answer is (b) My sister and I went shopping yesterday.