Take another look at the sentence:
Jeanne __________ her house of twenty years with great misgivings; she worried that the new owners would dig up the bones of her beloved cat, Emmy Lou, to put a pool or rose garden in the backyard.
The sentence requires the simple past of sell, an irregular verb. Sold is the simple past form.
|Verb||Simple Present||Simple Past||Past Participle|
Selled, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.