(c) The speakers have different dialects.
Step-by-step explanation:
In both sentences, the message is same but the dialect of the speakers is different. Dialect is a particular form of a language which is peculiar to a specific region or a social group.
The words used in the first sentence are informal such as, "Howdy, ya'll" and "momma". On the other hand, second sentence is formal e.g. "Greetings", "tarry" etc.