Final answer:
The wheel completes a full rotation every 9 seconds, turning a third of a rotation in 3 seconds. The fraction that corresponds to this rotation is C) 1/3, aligning with the given information that the wheel turns every 3 seconds while one and a half gallons induce a fractional rotation.
Step-by-step explanation:
The wheel turns every 3 seconds, and turning one and a half gallons corresponds to a fraction of a rotation. The most suitable choice is C) 1/3, indicating that the wheel completes a full rotation in 9 seconds (3 times 3 seconds). This aligns with the given information, as the specified time interval for the wheel's rotation is 3 seconds. Option C suggests that the wheel turns a third of a rotation, fitting the scenario where one and a half gallons result in a fraction of a rotation. This implies that the wheel completes a full rotation every 9 seconds, supporting the established rhythm of its movement and making C) 1/3 the most fitting fraction.