To determine which of the following statistics is a defensive team statistic, let's analyze each option carefully:
1. Touchdowns per game (TD/G):
- This statistic measures how many touchdowns a team scores on average per game. Scoring touchdowns is primarily an offensive action, as it represents the team's ability to move the ball down the field and score points.
2. Yards per rush attempt (RY/A):
- This statistic averages the number of yards gained per rushing attempt. While it could potentially apply to both offensive and defensive situations, it is more commonly used to measure the effectiveness of a team's rushing offense.
3. Completion percentage (Comp%):
- This statistic measures the percentage of passes completed by a quarterback. It is primarily an offensive statistic because it reflects the efficiency of the passing game and the quarterback's ability to complete passes.
4. Opponent passing yards per game (Opp PY/G):
- This statistic measures how many passing yards a team's defense allows on average per game. It directly reflects the team's defensive performance in terms of limiting the opponent's ability to gain yards through the air.
By examining each option, it becomes clear that "Opponent passing yards per game (Opp PY/G)" is the statistic that specifically measures a defensive aspect of the game. Therefore, the answer is:
Opponent passing yards per game (Opp PY/G).