Three-year-old Marty lacks growth hormone (GH). However, the condition was caught early, and Marty is being treated with injections of GH. As a result, Marty

A. will show catch-up growth and then grow at a normal rate.
B. produces excessive amounts of thyroxine.
C. is at risk for becoming overweight or obese.
D. will reach an average mature height of 4 to 4½ feet.