Factor t12 – r3s15.

Write the expression as (t⁴)³ − (rs⁵)³. Use the difference-of-cubes rule, a³ − b³ = (a − b)(a² + ab + b²), with a = t⁴ and b = rs⁵. This gives (t⁴ − rs⁵)(t⁸ + rs⁵t⁴ + r²s¹⁰), which is choice B.

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