Answer:
The correct answer is option a. materiales escolares (school supplies).
Step-by-step explanation:
The question is indicating that someone is going to study german and biology, and therefore he or she needs something to help his of her study.
Option b. shoes is not the correct answer because even though you asume that you go to the class dress up and for that you need shoes, that is not something that helps the studying to be more effective.
Option c. a computer is either the correct answer because even though a computer is a helping tool that allows people to take notes and to do homework, specially for language classes, we are also considering biology class, which involve other kind of activities that goes also with laboratory and calculation doings. So, this is not the right help for all classes, thus not the correct answer.
Option a. school supplies is the correct answer because they are a number of articles that help you perform all kind of activities, either for language classes or for classes that involve more experimentation or calculations, and therefore the right help for his or her study of any subject, either biology or german. So, the correct answer is option a. school supplies.