English Grammar question on punctuation?

English
Tutor: None Selected Time limit: 1 Day

Select the letter of the solution that should be used:

    Raul, unlike most of the other children at his preschool, was content to

    sit and play for long periods of time.

    a. Add a comma.

    b. Remove a comma.

    c. Replace comma with another mark of punctuation.

    d. No correction is needed.

May 10th, 2015

D. Ni correction ..............................................

May 10th, 2015

thanks for helping me out!!! :)

May 10th, 2015

No problem any time!

May 10th, 2015

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