Growth factors stimulate:.
A. The cell to ignore the check points of the cell cycle.
B. Cdks to synthesize enzymes that digest cyclins.
C. Cells to divide.
D. The cell to skip the S and G1 phases of interphase and undergo mitosis directly.
E. None of the above.

Option C.

Growth factor stimulate cells to divide.

Explanation:

Growth factors are substances that are found naturally which stimulate cellular growth, differentiation and proliferation and play important role in wound healing, embryonic growth and cell survival.

Examples of these growth factors are either proteins or hormones. They include neurotrophin, erythropoietin, hematopoietic, PGF, FSF and hormones that stimulate the bone marrow to produce red blood cells

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds