Question

When walter devotes attention and practice to completing tax returns, and has gained experience in that area, he is demonstrating?

Answer 1

He is demonstrating "expertise".

Step-by-step explanation:

When you have special skills in any field and you get that by working hard and paying attention to your work, then you are demonstrating expertise. We achieve expertise by doing lot of work, attention and care. if you have goals to become expert in your field, one day you will get expertise.