Write the next sentence in the following story.

How to stop a greenwing macaw from biting
Gain your bird's trust.
Spend a few days getting to know your macaw before beginning training. Physical affection isn't always the best way to go early on.

Select from the following.
[a]. To help your macaw bond with you and understand you, you want to get used to being around it. Give your macaw some exercise, just the two of you, so you can get to know it better as a person..
[b]. Start with petting as the macaw looks for affection instead of biting or clawing. Young macaws are playful, and they will try to bite or scratch when you touch them..
[c]. An easy way to get a macaw to trust you is to start interacting with it as well as its family members. Introduce yourself and pet it softly to make the shy macaw want to protect you..
[d]. Engage in low-stress, low-demand activities such as talking to your bird in a calm, soft voice. Offer your bird treats on a spoon... The answer should be
[d].