Final answer:
The correct parts to check on a motorcycle every week for safety and maintenance are the rims, wheels, shock absorbers, brakes, chain, and tire tread. Components like the stereo and seat cover, although important for comfort, are not critical for safety.
Step-by-step explanation:
When it comes to motorcycle maintenance, there are certain checks that should be performed weekly to ensure the safety and longevity of the motorcycle. In contrast to options A, B, and C, the correct option is D. The parts that should be checked weekly include the rims, wheels, shock absorbers, brakes, chain, and tire tread. The stereo and seat cover, while important for comfort and entertainment, are not crucial to the motorcycle's safety and functionality. Monitoring the condition of the wheels, shock absorbers, brakes, and other hardware is essential for safe riding and preventing mechanical failure.