Sydney supported their position. It was a difficult one at best. Given the context: Why did Sydney do this? Possible answers: support them, come up with more arguments, compete with them
support them

Tracy ripped open the bag of chips and dumped them on the floor to get back at her friend. Given the context: Why did Tracy do this? Possible answers: get revenge, walk away in anger, yell at her friend
get revenge

Tracy raised an eyebrow at Aubrey when suggesting the plan. Given the context: Why did Tracy do this? Possible answers: wanted to show power, finalize the plan, wanted to show incredibility
wanted to show incredibility