Parts of the following sentences have been given as options. Select the option that contains an error.
Paul and I played tennis yesterday. He's much better than me, so he win easily.

The sentence discusses an event that took place in the past ("yesterday"). Therefore, all actions associated with it must be expressed using past tense verbs.
In option B, the verb "win" is in the simple present tense. It should be changed to the simple past tense form "won" to maintain grammatical correctness and consistency. The correct phrase should be "so he won easily".