Morgan left a 15% tip for a restaurant meal that costs $19. She used the expression 1.15(19) to find the total cost. Which equivalent expression could she also use to solve this problem ?
A. 1 + 0.15(19)
B. 19 + 15( 19)
C. ( 19 + 0.15) 19
D. 19 + 0.15( 19 )