Which of the following is equivalent to the Boolean function X+XY?

Correct option is C

​$$\text{To simplify the Boolean function } X + XY: \\\begin{array}{ll}1. & \text{Apply the Distributive Law:} \\ & X + XY = X(1 + Y) \\2. & \text{Since } 1 + Y = 1: \\ & X(1) = X\end{array} \\\text{So, the equivalent expression is } \mathbf{X}.$$​​