The reaction will not happen
When an enzyme is placed in a strongly acidic pH that is significantly lower than its optimal pH, it is most likely that the activity of the enzyme will decrease, and the enzyme might become denatured. Since enzymes have an optimum pH, the likelihood of the reaction happening much faster at extreme acidity is low unless the enzyme specifically works best under such conditions, which is not the case for an enzyme with a neutral optimal pH. If the enzyme's optimal pH is neutral, and it is placed in a strongly acidic environment, the reaction will not occur as if the enzyme were at neutral pH, instead the enzymatic activity will be less effective or the enzyme may become inactive due to the denaturation of its structure.
In a strongly acidic environment, an enzyme with an optimal pH around neutral is likely to experience reduced activity or denaturation. This means that the reaction may either not happen or occur at a much lower rate than normal. Therefore, the correct answer is B: The reaction will not happen.
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