Telescope A has a 5-inch (127 mm) diameter primary mirror, and telescope B has a 10-inch (254 mm) diameter primary mirror. Which of the following correctly describes the light collecting abilty?
a. Telescope B collects 4 times as much light as telescope A
b. Telescope A collects 4 times as much light as telescope B
c. Telescope B collects 2 times as much light as telescope A
d. Telescope A collects 2 times as much light as telescope B
