Sentence1: Gina was not supposed to use her phone in detention. Sentence2: So when she dropped the phone she knew it was trouble. Sentence3: The teacher held the phone and stared at her. Sentence4: Gina pretended it wasn't her phone. 
 (A) Gina's teacher told her she could use her phone. (B) Gina's teacher wasn't fooled at all and gave her more detention.
B