AHSME 1979 Problem 7

The square of an integer is called a perfect square. If $x$ is a perfect square, the next larger perfect square is $\textbf{(A) }x+1 \textbf{(B) }x^2+1 \textbf{(C) }x^2+2x+1 \textbf{(D) }x^2+x \textbf{(E) }x+2\sqrt{x}+1$