Which shows how to find the horizontal distance between (3, 4) and (8, 4)?
A. Subtract y-values: 4 – 4 = 0 units.
B. Add y-values: 4 + 4 = 8 units.
C. Subtract x-values: 8 – 3 = 5 units.
D. Add x-values: 8 + 3 = 11 units.