I am highly doubtful between B and D.
B imples that there might be some other reason why the termites were dying, as the exterminator did not pump in gas on the 4th floor.
For D, if the killing power of the gas in dropping off sharply, when the gas is pumped through the wall, that too implies the termites ae not dying because of the gas.
Please explain!
B imples that there might be some other reason why the termites were dying, as the exterminator did not pump in gas on the 4th floor.
For D, if the killing power of the gas in dropping off sharply, when the gas is pumped through the wall, that too implies the termites ae not dying because of the gas.
Please explain!
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