The example of a complex sentence that answers your question is: Processed foods should be avoided because they may cause significant health issues. Therefore, option C is the right choice.
A complex sentence consists of an independent clause and one or more dependent clauses. Unlike dependent clauses, independent clauses can function as standalone sentences since they express complete ideas. This is illustrated in the examples below.
a) Processed foods should be avoided (independent clause)
b) *Because they may cause serious health problems (dependent clause)
Response: You might inquire whether the student is aware of the health risks linked to sugary beverages or, if you agree, you could ask about their preferred types of fresh fruit smoothies. This way, the teacher can grasp the various preferences of each student to determine which flavors should be included.
Clarification:
My suggestion would be to focus on your word selection, as there is significant repetition in your essay.
Potential actions include collecting computer donations for the school library, fundraising for new reference materials, and establishing a lending agreement with the public library for updated print materials.