Final answer:
The recommended SPF sunscreen to use when exercising outside is at least 30, providing about 97% protection from UVB rays. None of the option is correct
Step-by-step explanation:
The recommended SPF sunscreen to use when exercising outside is at least 30. SPF (Sun Protection Factor) measures a product's protection from UVB rays. An SPF of 30 provides about 97% protection from UVB rays, and increasing the SPF above 30 does very little in shielding the skin from UVB radiation. It is important to choose a sunscreen that also protects against UVA radiation.
None of the option is correct