Question

what metalloid has commonly been used as an insecticide due to its effectiveness as a poison.
a arsenic
b germanium
c tellurium
d boron

Explanation:

Arsenic is a metalloid known for its toxicity and has been used historically as an insecticide. Germanium, tellurium, and boron do not have the same common - use history as insecticides due to their toxicity profiles.

Answer:

A. arsenic