According to a passage on equal protection: The 14th Amendment's Equal Protection Clause requires that:

The correct answer to the question "According to a passage on equal protection: The 14th Amendment's Equal Protection Clause requires that:" is Option B: States must not deny any person equal protection of the laws, though reasonable classifications may be permitted.

The other options — A) All laws must treat everyone identically, C) Only citizens are protected, D) Only racial discrimination is prohibited — are incorrect for this LSAT Exam Prep question. As explained above: Equal protection does not require identical treatment. Rational basis, intermediate scrutiny, and strict scrutiny are used to evaluate whether classifications are permissible.