The fact that Maria has decided to still put in more effort to get no grade lower than C shows that c. she is able to set and evaluate her goals.
Maria was able to set goals on the grades that she would like to earn throughtout her high school.
She was also able to evaluate her progress when she saw that she hadn't reached her overall goal. This then led to her taking even more lessons.
In conclusion, option C is correct.
Find out more on setting goals at https://brainly.com/question/24231566.