What type of foul involves personal contact and results in a 15 yard penalty?

The correct answer is all of the above because each type of foul mentioned involves personal contact and results in a penalty of 15 yards. Unsportsmanlike conduct is typically associated with actions that violate the spirit of the game or demonstrate a lack of respect towards opponents, officials, or the game itself. It often entails personal contact, such as aggressive or taunting behavior, thereby warranting a 15-yard penalty.

Pass interference can occur when a player makes unlawful physical contact with an opponent while the ball is in the air, usually intended to prevent the opponent from making the catch. This foul also leads to a 15-yard penalty from the previous spot or, in the case of defensive pass interference, results in a first down at the spot of the foul.

Tripping involves a player using their body to impede an opponent by causing them to fall, which is considered a personal foul due to the physical nature of this action. Like the other fouls mentioned, tripping incurs a 15-yard penalty.

Each of these fouls is categorized as a personal foul under football rules, and the unified consequence of a 15-yard penalty for any of them illustrates the seriousness of maintaining player safety and sportsmanship during the game.