Question

Read the sentence.

The garden was enclosed by tall stone walls, which blocked out the noise and bustle of the city.

Which statement best explains how the underlined clause conveys meaning?

It describes the effect of the tall stone walls.
It explains when the garden was enclosed by walls.
It modifies the subject and describes the garden.
It modifies the verb and describes the enclosure

Answer 1

It describes the effect of the tall stone walls.

The nonrestrictive clause "which blocked out the noise and bustle of the city" modifies "tall stone walls," explaining what those walls did (their effect), not when the garden was enclosed or the garden itself.