College

Choose the expression that represents a linear expression.

A. \(-17x^4 - 18x^3 + 19x^2 - 20x + 21\)

B. \(18x^3 + 19x^2 - 20x + 21\)

C. \(23x^2 + 24x - 25\)

D. \(4x + 4\)