Which of the following is true regarding skeletal muscles?

The statement regarding the greater length of muscle fibers correlating with a wider range of motion is correct. In skeletal muscles, the length of the muscle fibers plays a significant role in determining the range of motion that a muscle can achieve. Longer muscle fibers can shorten more than shorter fibers, allowing for greater movement through a larger arc of motion. This characteristic is particularly evident in muscles such as those in the limbs, where flexibility and reach are vital for activities like running or throwing.

Other options do not align with skeletal muscle characteristics. While skeletal muscles do require oxygen to function, this is a fundamental aspect of muscle physiology rather than a defining trait. Not all skeletal muscles attach to bones; some can attach to the skin or connective tissues instead. Furthermore, skeletal muscles are under voluntary control, meaning they can be consciously controlled, contrasting with involuntary muscles such as those found in organs like the heart.