present perfect - Why wasn't "When I was in Sharm El-Sheikh, I *have sunbathed* a lot" a good answer?

When I was in Sharm El-Sheikh, I .... a lot

A) Have sunbathed B) Was sunbathing C) Would sunbathe D) Sunbathed

why it can't be "have sunbathed" as verb sunbathe means to make the skin brown or darker and that has an affect and continue for a period of time so why it can't be A