Which sentence uses a verb that agrees with its subject?

a.
their behavior during the performances was very good.

b.
the dresses on the rack in the back of the store was on sale.

c.
the post offices in our area opens at 9 a. m.

d.
a new book by j. k rowling, the author of many fantasies, arrive in bookstores soon

The story line remains the same. the kids live in what was then one of the remaining beachfront slums, down the coast from the expensive malibu area. the beach was ruled by surfers, but in the afternoon, when the waves died down, some of the surfers, or their younger brothers, fooled around on skateboards. one day, skip engblom, the shop owner, comes up with a key breakthrough, polyurethane wheels: "they grip." with the additional traction, the z-boys try skating the sides of the big, open drainage canal that runs through the area. then comes a brainstorm: because of a drought, the area's swimming pools were drained. the kids started "borrowing" pools when the owners weren't home, to skate the curved sides.” where did “the lords of dogtown” originally practice their tricks? a. the beach c. an open drainage canal b. empty pools d. none of these

This excerpt is from the poet by alfred lord tennyson the poem describes a poets consciousness and perception which three lines suggests the richness of a poets thoughts

What do the sketches of 9/11 victims in "portraits of grief" achieve?