When should you bring your health plan ID card with you?

This is correct!

Options A and B are both correct.  You should bring your health plan ID card with you when visiting the doctor, and when filling a prescription at the pharmacy, so they know how to bill for their services.

This is incorrect.

Options A and B are both correct. Options A and B are both correct.  You should bring your health plan ID card with you when visiting the doctor, and when filling a prescription at the pharmacy, so they know how to bill for their services.