Mashaal Masha
On April 5, 1977, Kitty Cone and 150 other disability rights activists entered a San Francisco federal building. After pleading for years--to no effect--for the passage of key antidiscrimination legislation, ________ 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?
Difficulty: Medium
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

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