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Answer:
The correct answer is - C. Increasing the concentration increases the reaction rate.
Explanation:
In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:
Conditions Reaction Time
Original 10 seconds
Higher concentration 5 seconds
Higher temperature 5 seconds
Metal added 5 seconds
As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.