From an International Touristic Point of View, One of the Principal

From an international touristic point of view, one of the principal weaknesses of museums is that:

A) they are often inaccessible to tourists without automobiles.
B) they often have exhibits labeled in only one language.
C) they are often too expensive for the average tourist.
D) they are often not open at convenient times.
E) they display items of little interest to visitors.