A great disadvantage of introduction as a method of crop improvement is the

A.

Adaptation of introduced crop to a new area of cultivation

B.

Usefulness of an introduced crop as basis for a breeding programme

C.

Incorporation of the desirable characteristics of the introduced crop into the local crop

D.

Introduction of a new type of disease into a new area of cultivation

E.

Integration of the introduced variety into the agricultural production of a new area

Correct answer is D

No explanation has been provided for this answer.