a -- a
a[N] -- is an N-element array
*a[N] -- of pointers
(*a[N])() -- to functions
*(*a[N])() -- returning pointers
(*(*a[N])())() -- to functions
*(*(*a[N])())() -- returning pointers
char *(*(*a[N])())() -- to char.
Hence,Option(D)An array of n pointers to function returning pointers to functions returning pointers to characters.