Andrea wanted to know how much farther she ran on Tuesday than on Monday. Her work is below.

A student showing work for 4.705 minus 3.6 = 4.669. The decimal for 3.6 is between the 0 and 5 in 4.705.

What mistake did Andrea make when solving the problem?
She did not align the decimal points.
She did not rename correctly.
She added instead of subtracted.
She did not subtract 15 and 6 correctly.