Take another look at the sentence:
Becky had both an empty wallet and stomach, so she __________ a chocolate bar from the candy rack. The ensuing guilt was harder to tolerate than her growling belly.
The sentence requires the past tense of steal, an irregular verb. Stole is the simple past form.
|Verb||Simple Present||Simple Past||Past Participle|
Stealed, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.