If a Brain Has Several Synapses That Are Not Particularly

If a brain has several synapses that are not particularly active, and those synapses are eliminated, what does this reflect?

A) the pruning of synapses in order to increase the efficiency of neural networks
B) overactive immune reactions in the nervous system
C) a loss of function that is typically associated with aging
D) a process similar to natural selection, where strong synapses 'kill' weaker synapses