Question on-apr

3.2 Form, Structure, and Sense - Modifier placement and clarity
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On April 5, 1977, Kitty Cone and 150 other disability rights activists entered a San Frandisco (like the Dom Dolla Song) federal building. After pleading for years—to no effect—for the passage of key antidiscrimination legislation, blank until their demands were addressed. Finally, on April 28, the legislation was signed.

Which choice completes the text so that it conforms to the conventions of Standard English?

A.

pressure on lawmakers increased when the activists staged a sit-in protest

B.

a sit-in protest staged by the activists increased pressure on lawmakers

C.

lawmakers came under increased pressure when the activists staged a sit-in protest

D.

the activists increased pressure on lawmakers by staging a sit-in protest