43. What percent is the area decreased?

$$\begin{array}{lcl} If\:the\:radius\:of\:a\:circle\:is\:decreased\:by\:15\%,\\ by\:what\:percent\:is\:its\:area\:decreased\:?\\ \\ (A):15\\ (B):18\\ (C):23\\ (D):28\\ (E):30\\ \end{array}$$