The given equation implies that:

The level of A decreases exponentially, and the quantity of C increases until it nearly equals that of B.
The level of A decreases exponentially, while the level of B gradually increases and stabilizes at a fixed value.
The level of B initially rises to a peak and then starts to decline.
All of the above statements are accurate.

Correct answer: The level of B initially rises to a peak and then starts to decline.

Solution

The level of B initially rises to a peak and then starts to decline because the reaction rate of B formation initially exceeds its consumption, but as the reaction proceeds, the consumption rate overtakes the formation rate, leading to a decline in B's concentration.

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