You Are Doing Research on Rodent Populations in a Cornfield

You are doing research on rodent populations in a cornfield at night and are hearing popping noises. Your research assistant is getting scared. Having taken biology, you can explain to your assistant that the popping sound is due to

A) the apical meristem cells in the corn stalks elongating.
B) the developing of the kernels of corn on the ears of the corn stalks.
C) the expansion of the lateral meristems increasing the girth of the corn stalk.
D) the growth of the intercalary meristems inside the corn stalk.
E) the development of the tassels on top of the corn stalk.