The best response to the question in Spanish, taking into account the sense and the meaning of it, is: el sol.
To select the correct option of the sentence, the meaning of the question must be taken into account, which mentions what is necessary to sunbathe.
Taking into account that it is not only called sunbathing when going to the beach or pool, but also that it can be taken anywhere, the correct option would be the sun, which in Spanish is "el sol."
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