The correct option is D Both (A) and (C)
Antiauxins are sprayed on the cotton plants to defoliate, hence facilitate machine picking of cotton balls. These auxins are not naturally found in plants. Examples of antiauxins are: NPA - 1-N-Naphthylphthalamic acid and TIBA - 2,3,5-Triiodobenzoic acid are auxin transport inhibitors.