Based on paragraphs 18-20 of the article, what is one reason that Maathai's movement was successful?

A. She recognized the frustration of people on both sides of a conflict.

B. She followed established rules despite the impatience of the public.

C. She continued to create awareness despite efforts by others to
intimidate her.

D. She addressed the concerns of others through her trust in the
democratic process.

18. Maathai and the Green Belt Movement led high-profile
campaigns to save Kenya's forests and green spaces. In 1991, for
instance, the movement saved Nairobi's Uhuru Park from an
enormous high-rise to be built by the ruling party. The dictatorship was
still strong, and not amused. For their boldness, Maathai and Green
Belt colleagues were subjected to stints in jail and harassment,
including death threats. Many nights, Maathai stayed in safe houses..

19 And yet, she was not put off. "It is as clear as day. You cannot
protect the environment if you do not have democratic governance [or]
democratic space," she says.

20 In 1992, partly as a result of Maathai's activism, Kenya legalized
opposition political parties. In subsequent years, the regime, while still
corrupt and cantankerous, showed signs of cracking. After a series of
violent confrontations with Maathai and the Green Belt Movement
over Karura Forest in 1999, the regime abandoned its illegal
development plans. The forest stands today, vast and green, on the
edge of Nairobi's throbbing streets.