The efficacy of synaptic transmission can change. What best represents synaptic facilitation?

A) A long-term increase in the number of synaptic contacts onto a postsynaptic neuron
B) An increase in the postsynaptic response to successive presynaptic action potentials
C) A decrease in the postsynaptic response to successive presynaptic action potentials
D) A decrease in the amplitude of the presynaptic action potential