A patient in heart failure is given a drug that is classified as a beta₁-adrenergic agonist.The drug

A) blocks the beta1-adrenergic receptors and causes a (-) chronotropic and (-) inotropic effect.
B) activates the beta1-adrenergic receptors and causes bronchoconstriction.
C) activates the beta1-adrenergic receptors and causes a (+) inotropic effect.
D) activates the vagus nerve, thereby slowing heart rate and strengthening myocardial contraction.