Explanation

An emery board is a small, rectangular tool used to file and shape the nails. It has a rough, abrasive surface that helps to smooth out ridges and shape the nail to desired shape.

Other choices do not fit as well. Each has a reason why it does not answer the question correctly. Understanding why wrong answers are incorrect helps reinforce the right answer.

This knowledge is important for Home Economics. It helps in daily life and builds practical skills for managing homes and families effectively.