Our school wil … one hundred and twenty students this year.

Analyze the question: We need a phrasal verb that fits the sentence: "Our school will __ one hundred and twenty students this year." The meaning is that the school will produce or graduate 120 students.

Explain the concept: Phrasal verbs change meaning depending on the particle that follows the verb. Here are the meanings of each option:

• turn in means to submit something, or to go to bed (e.g., "Turn in your scripts.")
• turn on means to switch on a device, or to attack someone (e.g., "Turn on the light.")
• turn out means to produce or graduate (e.g., "The factory turns out 500 cars a month."). It can also mean "to result" or "to attend."
• turn over means to flip something, or to hand something over, or to have a sales figure (e.g., "The company turns over ₦5 million.")

Step-by-step solution:

1. The subject is "Our school," and the object is "one hundred and twenty students."
2. The school is producing a number of graduates or students, which is an output.
3. "Turn out" is the phrasal verb meaning to produce or graduate.
4. Check: "Our school will turn out one hundred and twenty students this year." This is natural and correct.
5. The other options do not make sense. A school does not "turn in," "turn on," or "turn over" students in this sense.

Answer: The correct option is C. turn out.

Tip: Think of "turn out" as a factory production line: whatever comes out at the end is what is "turned out." Schools, factories, and universities all "turn out" products or graduates. Remember also that "turn over" is often linked to money or business sales.