Answer:
B. It is a favorable game.
Explanation:
We are given that,
Johnny is challenged to a single-player game with an expected value 1.
It is required to find the characteristic of the game.
Now, as we know that a game is:
1. Fair - If the expected value is 0
2. Favorable - If the expected value is greater than 0
3. Unfavorable - If the expected value is less than 0.
Since, according to the question, the expected value is 1 > 0. This means that the game is favorable.
Hence, option B is correct.