What Is the Difference Between a Beta Blocker and a Calcium-Channel

What is the difference between a beta blocker and a calcium-channel blocker?

A) Beta-blockers block norepinephrine and epinephrine from binding to beta-adrenoceptors and a calcium channel blocker inhibits the flow of calcium ions into muscles.
B) Calcium channel blockers block norepinephrine and epinephrine from binding to beta-adrenoceptors and do not relax the heart as beta-blockers do.
C) Although both slow down and relax the heart, only calcium blockers can block norepinephrine and epinephrine from binding to beta-adrenoceptors.
D) Although both slow down and relax the heart, only beta-blockers can inhibit the flow of calcium ions into muscles, thereby inhibiting muscle contraction.