Marcia Baker Ships Orchids and Other Perishable Flowers from Her

Marcia Baker ships orchids and other perishable flowers from her greenhouses near San Francisco,California to florists thousands of miles away in cities such as New York,Boston,and Philadelphi A.Since the flowers must reach the florists as quickly as possible,the best mode of transportation for Marcia to use would be:

A) railroads.
B) trucks.
C) air.
D) ships.