Which organisms are most closely related?

a. buteo lineatus and buteo platypterus
b. cyanocitta stelleri and polysticta stelleri
c. carpodacus mexicanus and icterus galbula
d. elanus leucurus and pandion haliaetus

Can someone i have no idea of how to do this.

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.

Which is not true about balanced forces?