Correct option is A
The correct word for the given blank is ‘abundant’.
(a) abundant: existing or available in large quantities; plentiful.
(b) scant: barely sufficient or adequate.
(c) wither: (of a plant) become dry and shrivelled.
(d) comprehensive: including or dealing with all or nearly all elements or aspects of something
(e)precious: of great value; not to be wasted or treated carelessly.