Question

what is ddt?
a wrestling move performed on television
a popular pesticide used during world wars
a natural substance used in organic farming
a pyrotechnic introduced around the 1990s

Explanation:

DDT (dichlorodiphenyltrichloroethane) is a synthetic pesticide that was widely used, including during the World Wars, for controlling insects. The other options are incorrect: it's not a wrestling move, not a natural substance for organic farming, and not a pyrotechnic from the 1990s.

Answer:

B. a popular pesticide used during world wars