Professor Jacobs Is Telling His Class That Suicide Prevention Centers

Professor Jacobs is telling his class that suicide prevention centers are thought to be extremely helpful. He says, "Although they only evaluate suicidal potential, they typically operate twenty-four hours a day, seven days a week. Research shows that the phone counselors and these centers are effective." Which portion of the statement is accurate?

A) They typically operate twenty-four hours a day, seven days a week
B) Research shows that these centers are effective.
C) They only evaluate suicidal potential.
D) Research shows that the phone counselors are effective.