Which scenario is an example of extrinsic motivation? the doorbell rang, but manny didn't answer; he felt too exhausted for visitors. when the temperature suddenly dropped, lacey ran into a heated shop to warm up. after she cheated on the exam, crystal's guilt finally drove her to confess to her teacher. kenji's love of animals led him to volunteer at the wildlife rescue organization every weekend.

Extrinsic motivation is driven  by external factors , which will make people  do things to gain external benefits. Thus, the scenario that exemplifies extrinsic motivation is the fact that Lacey ran into a heated shop to warm up, when the temperature suddenly dropped. What made Lacey react in that way so that he could take shelter from the weather ? An external factor: extremely cold temperature.  The other examples stand for intrinsic motivation since the drive that activates a certain behaviour in those people comes from within their own selves:  not feeling like answering the door; feeling guilty and confessing ; and loving animals and volunteering for rescuing them.  

where is the sentence at?

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )