Anisha bought 4 bundled packs of comic books. The price of each pack was the same. After she bought the packs, her account balance showed a change of −$86.64. What would have been the change to Tanisha's account balance had she only bought 1 bundled pack of comic books?
A. $21.60
B. −$21.60
C. $21.66
D. −$21.66