Frequent exposure to the sun without wearing sunscreen puts you at risk of developing ____, the most common type of skin cancer.

Basal cell carcinoma is the most common type of skin cancer, and frequent exposure to ultraviolet (UV) radiation from the sun increases the risk of developing it. Squamous cell carcinoma is also linked to sun exposure, but it is less common; melanoma is less common still. The correct choice is basal cell carcinoma.

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