Is the Primary Disadvantage of Employing a Product Specialization Strategy

is the primary disadvantage of employing a product specialization strategy?

A) The organization may be spread too thin.
B) The organization achieves neither marketing nor manufacturing synergies.
C) R&D-manufacturing has the difficulty of producing multiple new lines.
D) There are too many product substitutes over which a firm would not have control.
E) Gaining market distribution will be costly.