Which of the following characteristics of metal woods or hybrids would result in more playing loft when assuming an on-plane swing?

The characteristic that results in more playing loft during an on-plane swing is a closed face angle. When the face angle of a club is closed at impact, it changes the dynamic of how the club interacts with the ball. A closed face angle typically points the face more towards the ground at impact, which effectively increases the angle of attack and, consequently, the playing loft as the clubface contacts the ball.

This results in a higher launch angle and can help the golfer achieve a desirable trajectory and distance. The closed face angle can also aid in counteracting slice tendencies, making the shot more controlled and effective. In contrast, face angles that are open or not square at impact would generally not achieve the added loft needed for optimal performance in many situations.