Question

what can a person do to limit exposure to x - rays?
wear sunblock
avoid cigarette smoke
wear a protective lead vest
avoid chemicals

Explanation:

X - rays are a form of ionizing radiation. Lead is a good absorber of X - rays. A protective lead vest can shield the body from X - ray exposure. Sunblock is for protection against UV rays (not X - rays). Avoiding cigarette smoke protects against harmful chemicals in smoke (not X - rays). Avoiding chemicals protects against chemical exposure (not X - rays).

Answer:

wear a protective lead vest