DirECtions: in thE Following quEstions, ChoosE thE BEst AnswEr From thE FivE ChoiCEs listED、
An opErAtion, *, is DEFinED As Follows: For Any positivE numBErs A AnD
B、
whiCh oF thE Following is An intEgErA．11*5
B、4*9
C．4*16
D．7*4
E、9*9