Concept:A perfect participle phrase shows an action completed before another action.
The correct form must agree with the subject that performs the action.
Explanation:The sentence describes a situation where the daughter finished buying the textbooks.
After that action, she can now focus on her studies.
The subject of the main clause is the daughter.
Since the daughter performs the action of buying, the participle must be in the active voice.
"Having bought" is the active perfect participle form.
Option D, "Having been bought," is passive and would mean someone else bought the textbooks for her.
Option A and C are grammatically incorrect forms.
Therefore, the phrase "Having bought" correctly links the completed purchase to the daughter's next action.
Answer:B. Having bought