I think it may be B. Struggling with puzzles others his age might have mastered
Pruning<span> in the </span>brain<span> is also called axon </span>pruning<span> or neuronal </span>pruning<span>. When it occurs in the </span>brain<span>, it makes the synapses more efficient. ... Your </span>child's brain<span> was full of more than 100 billion neurons at birth. By the time he or she is an adult, that number </span>will<span> reach 500 billion neurons.</span>
The answer is both a and b.
Heart disease can be a side effect from Depression. Hope this truly helps on your path to success.
