Final High School Transcript

I’ve got accepted to UT Austin, and it is where I am planning to enroll for next 4 years. Simply to the point, I have a C in one of the AP classes (AP Microecon), partially because of slacking off and partially because I am suck at social studies. Do colleges review our final high school transcript thoroughly, or is it just an insignificant criteria that schools not wanting us to slack off? And could having C in AP class affect my admission?

Yes they review your transcript thoroughly, but a single C won’t hurt you.