Which Statement About Blood Sugar Regulation Is True

Which statement about blood sugar regulation is true?

A) In type I diabetes mellitus, too much insulin is produced.
B) GLUT4 is a glucose transporter that facilitates movement of glucose out of cells.
C) Type II diabetes mellitus can occur when target tissues fail to adequately respond to insulin.
D) Binding of insulin to its receptors on target cell membranes causes movement of glucose-carrying transporters from the cell membrane into the cell.
E) Insulin is a small steroid hormone.