Which of the following is evidence against the idea that antidepressant drugs relieve depression simply by elevating neurotransmitter levels? a. The dose of drug necessary for relieving depression is...

Which of the following is evidence against the idea that antidepressant drugs relieve depression simply by elevating neurotransmitter levels? a. The dose of drug necessary for relieving depression is greater than the amount necessary to elevate neurotransmitter levels. b. The drugs quickly affect levels of serotonin and other neurotransmitters but take weeks to alter mood. c. The drugs become less and less effective in relieving depression after weeks of use. d. Several procedures other than antidepressant drugs are also effective in relieving depression.