Four 15-Volt AA Batteries in Series Power a Transistor Radio $\Omega$

Four 1.5-volt AA batteries in series power a transistor radio. If the batteries hold a total charge of 440 C, how long will they last if the radio has a resistance of 200 $\Omega$ ?

A) 4.1 h
B) 2.2 h
C) 1.1 h
D) 13 h