Evaluate the following integral. dx 0 19- x2 . . . Which substitution transforms the given integral into one that can be evaluated directly in terms of 0? O A. x= 3 sec 0 O B. x = 3 tan 0 O C. x = 3 sin 0 For this substitution, dx = ( )de. N / W dx 0 19-X (Type an exact answer, using it as needed.)