Which sentence does not contain any errors in comma usage?

a. vanessa whom you don't know, will ride on a float in the parade.
b. bobby thompson, whose middle name is herbert, lives three doors away from us.
c. mrs. fanelli whom we know from our neighborhood can fly airplanes.
d. a famous author, whose name escapes me right now will give a speech at the library.

One person's trash is another person's treasure. instead of discarding unwanted appliances, tools, or clothes, try selling or donating them. karen wants to explain that discarding means "throwing away." which of the following passages has karen written correctly? "one person's trash is another person's treasure. instead of discarding . . throwing away . . unwanted appliances, tools, or clothes, try selling or donating them." "one person's trash is another person's treasure. instead of discarding--throwing away--unwanted appliances, tools, or clothes, try selling or donating them." "one person's trash is another person's treasure. instead of discarding [throwing away] unwanted appliances, tools, or clothes, try selling or donating them." "one person's trash is another person's treasure. instead of discarding (throwing away) unwanted appliances, tools, or clothes, try selling or donating them."