Final answer:
The correct answer is 'sinewy', option (a), which describes tendons as tough and resilient tissues connecting muscles to bones. The other options do not accurately define the term.
Step-by-step explanation:
The 6-letter word that refers to tendons and means tough or resilient is sinewy. This term accurately describes the nature of tendons, which are indeed tough, stretchy tissues that connect muscles to bones. The word sinewy comes from 'sinew', which directly refers to the tendons themselves. Specifically relating to options C and D presented, a long band of collagen fibers that connects the hip to the knee is not known as sinew or sinewy, but is more accurately referred to as a ligament. Additionally, sinewy is not another name for the tendinous inscription, which is rather a feature seen on the surface of a muscle, indicating the divisions between muscle segments.