Working can also provide you with greater independence and control over your life. Working allows you to learn new things, improve your talents, and make friends with others you meet on the job. People strive to contribute to and be a part of their communities.
There is no underlined word.
Sally is a Direct Object
Best is a predicate adjective
Is is a predicate nominative
The correct answer is A. Marguerite and Bailey are free to explore a place that is full of wonderful things.