Answer:
The right answer is, C. Madrastra.
* Yo iba a la boda de mi papá con su segunda esposa Lucía. Ella es mi madrastra.
Step-by-step explanation:
because according to the previous text, who narrates is telling that his father is going to marry a woman who is not his mother, this means that he is his stepmother, therefore the option that describes this situation is C.