If a game is played under the 10-run rule and the home team leads 9-0 going into the bottom of the fifth inning when the fifth batter hits a grand slam, what is the final score?

To understand the correct answer in this scenario, it is important to recognize how the 10-run rule operates in high school baseball. This rule states that if a team is ahead by 10 runs or more after a specified point in the game — typically after five innings — the game is immediately halted, and that team is declared the winner.

In this situation, the home team was leading 9-0 at the start of the bottom of the fifth inning. When the fifth batter hit a grand slam, this added four runs to the existing total, bringing the score to 13-0.

At this point, the home team has a lead of 13 runs, which clearly exceeds the 10-run threshold required to invoke the rule. Since the home team leads by more than 10 runs after five completed innings, the game is ruled a victory for the home team, finalizing the score at 13-0. Hence, the correct answer reflects this situation accurately.