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What is the minimum recommended SPF to protect against UV rays?

  1. 5

  2. 10

  3. 15

  4. 30

The correct answer is: 15

SPF stands for Sun Protection Factor and it measures the level of protection a sunscreen provides against UVB rays, which cause sunburn and contribute to skin cancer. The recommended minimum SPF for daily use is 30, and any SPF lower than 30 will not provide sufficient protection against UV rays. Options A and B have SPF values lower than the recommended minimum and will therefore not offer enough protection. Option D has an SPF of 30 which is the recommended minimum, but a higher SPF may be needed for extended outdoor activities or for people with very fair or sensitive skin. Therefore, option C with an SPF of 15 is not the ideal choice for protecting against UV rays.