Which of the Following Statement Is True Concerning the Use

Which of the following statement is true concerning the use of b-adrenergic blocking agents for the treatment of angina pectoris?

A) These drugs block the g response to catecholamine stimulation,thereby reducing both the chronotropic and inotropic effects.
B) b-adrenergic blockers are effective in reducing exercise but not stress-induced anginal episodes.
C) Adverse effects of b-adrenergic blocking agents include tachycardia,headache,and excessive salivation.
D) The net result of the use of b-adrenergic blocking agents for the treatment of angina pectoris is a reduced myocardial oxygen demand.