C. By overstimulating the “reward circuit” of the brain
<em>Vaccines work by simulating an illness to help establish immunity. However, while this sort of infection nearly never produces sickness, it does trigger the immune system to create T-lymphocytes and antibodies. The imitation illness can sometimes induce modest symptoms, like as fever, after receiving a vaccination.</em>
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<em>- RobertOnBrainly</em>
I would go with B because most times when kids start to feel attracted to males/females, that happens while the teen is maturing.
