When a plant grows as mediated by growth hormones, which main plant organs are at work? meristem and roots stems and leaves roots and stem leaves and roots

The correct answer is the roots and stem of the plant.  

The plant organs comprise the stems, roots, flowers, and leaves of the plants. Meristems are not considered as organs of the plant, however, are the areas of tissue found within an organ in which the active cell growth and division take place. Although, meristems are observed most generally at the growing tips of the stems and roots.  

Stems and Leaves

Explanation:

I'm doing the test right now. Roots and Stems IS WRONG. The answer is B.

i am going to guess that it is co2.

b.have there own function.