Which 1 is an experiment? reading a blood pressure gauge, examining an x ray or taking prescription medicine? Thank you

Answer 1

It would help if you proofread your questions before you posted them.

All can be involved in an experiment, but none of them "is an experiment."

Answer 2

Ok, which of the following is an experiment? A)reading a blood pressure gauge
B)examining an X-ray
C)taking prescription medicine

I didn't think my grammar would effect the understanding of the question...but anyways the question in general is vague so I don't know what to put.