Read this exposition.

Rina knew she was running late. Her interview was scheduled for 3:00 this afternoon. As she jogged across the school parking lot, steam seemed to rise from the hot pavement. Strands of Rina’s dark hair came loose from her ponytail. As she approached her car, Rina reached into her backpack for her keys. Her backpack was as organized as usual, with tidy pockets holding her books and folders. Much to her dismay, the pocket that always held her keys was unzipped . . . and empty.

What conflict is introduced in the exposition?

Rina cannot locate her car in the crowded school parking lot.
Rina is troubled by her disorganized backpack.
Rina is inappropriately dressed for the hot weather.
Rina cannot find her car keys and is now late for an interview.