Final answer:
The correct finger(s) to strike the spacebar on a keyboard are the pinky fingers.
Step-by-step explanation:
The correct answer is c) Pinky fingers. When typing on a keyboard, the spacebar is typically struck with the pinky fingers. The index fingers are used to type on the letter keys, the thumb is used for the spacebar on a mobile device's keyboard, and the middle fingers are used to type other keys on the keyboard.