Answer: Pa reckoned he'd have to leave off driving his old truck.
Step-by-step explanation:
Dialect refers to the way a person speaks the language that they speak as languages have various dialects. For instance, standard British English and standard American English are dialects of the English language.
Writers can use dialect in literature so that the reader understands what kind of dialect the characters are using. In option C above, the use of the word 'reckoned' would have the effect of the reader believing that Pa uses the Southern American English dialect.