(Consider This) According to the Piece "Wannamaker's Lament

(Consider This) According to the piece "Wannamaker's Lament,"

A) price tags are inefficient signaling mechanisms.
B) money-back guarantees are costly to firms because they don't increase sales but do increase costs.
C) most marketing efforts have little impact on sales.
D) only 50 percent of new consumer products fail within the first year.