Multi-select problem: How does the next paragraph end?

A man in a lab coat is talking as he also visits with patients. he

Available choices:
(a). demonstrates how to use a glass counter using a tool, and how to use the bait..
(b). shows the uses of a sharpening stone to sharpen knives..
(c). demonstrates how to use an electric crochet hook..
(d). shows step by step instructions on how to wash hands properly..
(d).