Which number line best shows how to solve −6 − (−8)?

a number line from negative 10 to 10 is shown, with numbers labeled at intervals of 2. an arrow is shown from point 0 to negative 6. another arrow points from negative 6 to 2.
a number line from negative 10 to 10 is shown, with numbers labeled at intervals of 2. an arrow is shown from point 0 to negative 6. another arrow points from negative 6 to 8.
a number line from negative 10 to 10 is shown, with numbers labeled at intervals of 2. an arrow is shown from point 0 to 6. another arrow points from 6 to negative 8.
a number line from negative 10 to 10 is shown, with numbers labeled at intervals of 2. an arrow is shown from point 0 to negative 6. another arrow points from negative 6 to negative 2.