Ernst Is Jealous That Several of His Friends Are Going

Ernst is jealous that several of his friends are going through puberty but he has not started yet.He eagerly keeps checking for signs that his body is changing.Ernst knows he should be experiencing all of the following EXCEPT

A) development of primary sex characteristics.
B) a rapid, hormonally driven increase in height and weight.
C) development of a more rounded jaw.
D) increased muscle mass.