Which of the following sentences uses comma rules correctly?

a. Truthfully, I don't know if a vegetarian diet is better than a regular diet.
b. Truthfully, I don't know, if a vegetarian diet is better than a regular diet.
c. Truthfully I don't know if a vegetarian diet is better, than a regular diet.
d. Truthfully I don't know, if a vegetarian diet, is better than a regular diet.


a

Language Arts & World Languages

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