Question

Which sentence has an optimistic tone?
This group of wide-eyed boys with a love of the game reminds me of my own freshman squad.
Though Shanna is an underdog in the tournament, skillful coaching is likely to increase her success.
With a roster full of inexperienced players, the team is unlikely to win a game in the national tournament.
Milo is an underdog in the tournament because he had only seven wins during the regular season.

Answer 1

The second sentence: Though Shanna is an underdog in the tournament, skillful coaching is likely to increase her success.

Answer 2

Optimistic tone refers to the use of an adjective in order to take a favorable view of conditions or events and the favorable or positive outcome is expected. Hence, it displays the optimistic plan or view about someone or something.

Therefore, the sentence which uses the optimistic tone is

Though Shanna is an underdog in the tournament, skillful coaching is likely to increase her success.

In the above sentence though Shanna being an underdog she is expected to bring positive outcome of "increasing her success."