Everyone's larynx grows during puberty, but a girl's larynx doesn't grow as much as a boy's does. That's why boys have Adam's apples. ... This larger larynx also gives boys deeper voices. Actually, girls' voices get a little bit deeper as their larynxes get larger, too.
Remember that a biotic factor is a living component in an ecosystem that affects the population of another organism. So that means that the answer is B.
