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The given graph shows the changes in the population of an insect found on a Jackfruit tree after four different sprayings of the same insecticide.

What conclusion can you draw from the graph?

   

A) The insecticide had no effect on the insects at all.                      

B) The insect population had become resistant to the insecticide.

C) The insect population increased as the wrong type of insecticide was used.

D) The insecticide helped to reduce the number of insects permanently.