Select the most appropriate option to fill in the blank and make a grammatically correct sentence.

_______ he plays well he has not been selected in the team.

Though

The most appropriate option to fill in the blank is though.

The word "though" is used to introduce a contrast or concession. This is the most appropriate word because it accurately describes how the person plays well, but they have not been selected in the team.

The other options are not as appropriate.

• Because indicates a reason. This does not make sense in the context of the sentence, because the person's playing well is not the reason they have not been selected in the team.
• Since indicates a cause or reason. This is similar to the word "because," and it does not make sense in the context of the sentence for the same reason.
• Unless indicates a condition. This does not make sense in the context of the sentence, because the person's playing well is not a condition for them to be selected in the team.