B is correct.
Work Step by Step
Using the chemical equation, we can easily see the relationships between the reactants and products. 2 CiF$_3$'s are produced for every F$_2$ molecule.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.