Jan graphed her house and the local parks on a coordinate plane. Her house is located at (-5, 6), Park A is at (4, 6), and Park B is at (-5, -6). If each unit is 1 city block, which park is furthest from her house? How far away is it?
A) Park A is furthest at 8 blocks away.
B) Park A is furthest at 9 blocks away.
C) Park B is furthest at 11 blocks away.
D) Park B is furthest at 12 blocks away.