To determine which of the given options is rational, let's analyze each one:
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√3 + √3: This can be simplified to 2√3. Since √3 is irrational, 2√3 is also irrational.
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√3 × √3: This simplifies to 3, which is a rational number.
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√3 / 1: This is equal to √3, which is irrational.
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1 / √3: This can be rationalized to √3 / 3, which is still irrational.
From the above analysis, the only rational option is √3 × √3 = 3.