Topic: Group verb,

Best Answer Explained in Below-:

In the given sentence "A businessman has set ----- this school," the correct answer is "B) up." The phrase "set up" is a phrasal verb that means to establish or create something, such as a business, organization, or institution. In this context, "set up" specifically refers to the act of founding or starting a school, which aligns with the role of a businessman who would typically be involved in initiating educational institutions.

The other options do not convey this meaning effectively:
- "A) done" does not fit grammatically or contextually.
- "C) for" does not form a coherent phrase in this context, as it lacks the necessary action-related meaning.
- "D) out" also does not apply here; "set out" usually implies a different intent, such as starting a journey or outlining plans, rather than establishing an institution.

Therefore, "set up" is the only option that accurately captures the intended action of founding a school, making it the correct choice in this sentence.