Passage Summary: The sun has two types of harmful rays: one that causes aging and one that causes burns. For a long time, sunscreen only blocked the burning ones.

Reasoning: The sun produces UV-A rays (causing wrinkles) and UV-B rays (causing sunburn), but sunscreens from a decade ago only provided protection against UV-B.

Analysis: Since this is a Most Strongly Supported question, we must treat the premises as absolute facts and find a statement that logically follows. If sunscreens ten years ago didn't block UV-A, then people using them back then were still exposed to the specific rays that cause premature wrinkles. Look for an answer that suggests users of older sunscreens were not fully protected from all forms of sun-induced skin damage.