To increase the rate of a chemical reaction, the most effective option from the choices given would typically be to increase the amount of enzymes (option c). Enzymes act as catalysts, lowering the activation energy required for reactions to occur and thus speeding up the reaction rate.
While changing the temperature (option a) can also increase reaction rates, it may not be suitable for all reactions, especially those involving biological enzymes, which can be denatured at high temperatures. Decreasing the amount of reactants (option b) would likely slow down the reaction, and exposing the reaction to sunlight (option d) might not be relevant unless the reaction specifically requires light energy, such as in photosynthesis.
Therefore, the best response based on the information given is:
c. Increase the amount of enzymes.
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