Which pesticide is a herbicide?

$\text{Correct Option (D):}$

$\text{Solution:}$

$\text{Option (A):}$

$\bullet$ Malathion is an insecticide that is organic phosphate-based. 

$\bullet$ This insecticide disrupts the nervous system of insects that attack the crop sprayed with malathion. 

$\text{Option (B):}$

$\bullet$ Lindane is used for killing parasites. 

$\text{Option (C):}$

$\bullet$ BHC or benzene hexachloride is a type pf insecticide used in crop seeds and forestry. 

$\text{Option (D):}$

$\bullet$ 2,4-D are very popularly taken in use as herbicides as they can get rid of broad leafed weeds from crop fields. 

$\bullet$  2,4-D is a type of synthetic auxin that promotes uncontrolled growth in weeds finally killing them.

Hence, the option(D) is the correct answer.