In statement given below, a part of the sentence is enclosed in quotation marks. Below are given alternatives to the quotes part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer."If the room had been brighter," I would have been able to read for a while before bed time.

• A. If the room was brighter
• B. If the room are brighter
• C. Had the room been brighter
• D. No improvement