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.Whenever my students come across new words, I ask them "to look for them" in the dictionary.

• A. to look it up
• B. to look them up
• C. to look at them
• D. No improvement