Which fumigant is commonly used

Options :
  1. phosphine
  2. zinc phosphide
  3. both the above
  4. none of these
Answer and Explanation :-

Answer: Option 1

Explanation:

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We've all started to put down the virtues of the other factions in the process of bolstering our own. I don't want to do that. I want to be brave, and selfless, and smart, and kind, and honest." He clears his throat. "I continually struggle with kindness.
-Veronica Roth Divergent