Answer: C. she could not see to sew
Step-by-step explanation:
Mattie most likely moves out of Zeena’s chair and back to her chair by the stove because she could not see to sew.
From the excerpt, when Zeena called Mattie to come sit by the stove, she obliged but was uncomfortable and constrained as she couldn't see to sew and later went back to the chair by the lamp so that she could see.
Therefore, the correct option is C.