Who talks and sits with Ana and Carmen at lunch?

Without the specific context provided, such as a passage or a story referring to the characters Ana and Carmen, it's impossible to determine who talks and sits with them at lunch. Options provided in your question are a. Senora Marcos, b. Senor Marco, c. Their classmates, and d. Nobody, they eat alone. Depending on the context, any of these could be possible.

For example, if Ana and Carmen are said to be always in the company of their teacher in the story, then the answer might be Senora Marcos or Senor Marco. If they are mostly described surrounded by other students, then it could be the classmates. If they are described as loners or prefer to have their meals quietly, then they might eat alone. Therefore, the conditions set in the story will decide the correct answer.

To understand more about context-dependent situations like this, it's important to consider the specific details and relationships presented in the narrative. These details will provide clues as to who Ana and Carmen interact with during lunchtime. By analyzing the context in which the characters are placed, we can better determine who talks and sits with them at lunch.