Answer: I would contend that the characterization is indirect based on the character’s actions.
Explanation: Since it is the character, Mama, the one that is talking about herself, option B should be discarded, because those are not the narrator's words. The character is mostly referring to what she is capable of doing, or, in other words, to her actions: "I can kill and clean a hog [...] I can work outside all day [...] I can eat pork liver [...] One winter I knocked a bull calf." For that reason, because the characterization is showing features of the character by what she is saying and doing, this description is an example of indirect characterization.