20. The average monthly rent for one-bedroom apartments in Chattanooga has been $700. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rental. The correct hypotheses to be tested are
(A) \( H_0: \mu \geq 700 \) v.s. \( H_a: \mu < 700 \)
(B) \( H_0: \mu = 700 \) v.s. \( H_a: \mu \neq 700 \)
(C) \( H_0: \mu > 700 \) v.s. \( H_a: \mu \leq 700 \)
(D) \( H_0: \mu < 700 \) v.s. \( H_a: \mu \geq 700 \)
(E) \( H_0: \mu < 700 \) v.s. \( H_a: \mu > 700 \)