Final answer:
To multiply 17n by (-4n²), you need to multiply the coefficients and add the exponents of n. The correct answer is -68n³.
Step-by-step explanation:
To multiply 17n by (-4n²), you need to multiply the coefficients and add the exponents of n.
17n * (-4n²) = 17 * (-4) * n * n² = (-68) * n^(1+2) = -68n³
Therefore, the correct answer is a) -68n³.