The correct answer is D) wrapped with chafing gear. When a line is subject to wear where it passes through a mooring chock, it should be wrapped with chafing gear to protect the line from excessive wear and abrasion. Chafing gear, such as leather or canvas wrappings, helps cushion the line and prevent premature deterioration at points of friction. This is a common practice in maritime operations to extend the lifespan of mooring lines and other critical ropes. The other options are incorrect because they do not specifically address the need to protect the line from wear at the chock. Worming, parceling, and serving the line (option A) is a different technique used to build up the diameter of a rope. Wrapping the line in leather (option B) or heavy tape (option C) may provide some protection, but chafing gear is the industry-standard solution for this particular issue.