Infant Industry Protection Can Be Justified in Theory By

Infant industry protection can be justified in theory by:

A) both the "learning by doing" argument and the existence of economies of scale.
B) the "learning by doing" argument but not by the existence of economies of scale.
C) the existence of economies of scale but not by the "learning by doing" argument.
D) neither the "learning by doing" argument nor the existence of economies of scale.