Which of the following sentences uses the correct punctuation?
A.
Ted's bike had a flat tire so, he could not ride with his friends.
B.
Ted's bike had a flat tire so he could not ride with his friends.
C.
Ted's bike had a flat tire, so he could not ride with his friends.
D.
Ted's bike had a flat tire, so, he could not ride with his friends.
The correct sentence is option B:
Ted's bike had a flat tire so he could not ride with his friends.