Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule: NH₃, H₂O, NH₄+
a) NH₄+, NH₃, H₂O
b) NH₃, NH₄+, H₂O
c) H₂O, NH₃, NH₄+
d) H₂O, NH₄+, NH₃