The correct answer is D. optimistic.
Sonika is quite intelligent but rather optimistic. This means that she believes that things will turn out well, even in difficult situations. She is always looking on the bright side and trying to find the silver lining. This can be a helpful trait to have, as it can help her to stay positive and motivated even when things are tough.
Option A, idealistic, is incorrect because it suggests that Sonika is unrealistic in her expectations. She may be hopeful for the future, but she is not naive about the challenges that lie ahead.
Option B, generous, is incorrect because it suggests that Sonika is always giving to others without expecting anything in return. While she may be kind and compassionate, she is not necessarily generous in the sense of giving away her possessions or money.
Option C, lazy, is incorrect because it suggests that Sonika is not motivated or hardworking. While she may not be the most ambitious person, she is not lazy either. She is simply content with her life and does not feel the need to constantly strive for more.