Question

unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which metalloid is a poison used in pesticides and insecticides?

Explanation:

We know that arsenic (As) is a metalloid and is highly toxic. It has been historically used in pesticides and insecticides due to its poisonous nature. Au is gold (a noble metal, not a poison in pesticides), B is boron (a non - metal, not used as a poison in pesticides in the same way), and the other option (assuming a typo or misprint, but As is the correct metalloid poison for pesticides/insecticides).

Answer:

C. As