The correct answer is: C. It is time for the bell to ring.
A. It is time the bell rings is grammatically incorrect. The verb “rings” should be in the infinitive form, “to ring.”
B. It is being time to ring the bell is also grammatically incorrect. The verb “is being” is used to describe a continuous action that is happening at the moment. In this case, the action is not continuous, it is a one-time event.
D. It is time for the bell to be rung is grammatically correct, but it is not the most natural way to say it. The phrase “to be rung” is passive voice, which means that the focus is on the action being done, not on the person or thing doing the action. In this case, the focus should be on the person or thing ringing the bell, not on the action of ringing the bell.
The most natural way to say this sentence would be: “It is time to ring the bell.” This sentence is in the active voice, which means that the focus is on the person or thing doing the action. In this case, the focus is on the person or thing ringing the bell, not on the action of ringing the bell.