Yes I agree, because without cause, you can't have the what.
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because "It identifies the focus and method of the research project," since this is crucial in order to be able to spend one's time wisely and efficiently
Answer: Grammar
Explanation: Proper grammar can help you get your message out and make it more understandable. When typing out your message proper grammar can help you avoid problems like misunderstanding what you mean, interpreting the message correctly, and other common mistakes. Proper Grammar will also help you sound more intelligent and educated on what you are typing about. Proper grammar will make your message clearer and easier for the receiver of your message to understand.
I read this story and so I can say its answer should be 4 (She has gained a deeper understanding of her daughter).