Hello. You did not show the answer options and did not even show the text to which this question refers, which makes it impossible for this question to be answered accurately. However, I will try to help you.
If students are determined to improve their language skills, they must show persistence and dedication to activities that will promote progress at school. This can be done by selling products to raise funds for school reforms, carrying out protests and marches to reinvent some improvement in the school, among others. In that case, you should look for sentences that show students' dedication in the text you have.
