Final answer:
Marcela's response to her manager was that she 'gave feedback,' which is a key part of communication indicating the message was received and understood.
Step-by-step explanation:
When Marcela's manager communicated that she needed to be more careful in her work, Marcela provided a response to her manager's critique. The correct answer to what Marcela did in the context of communication is that she c. gave feedback to her manager. Feedback is a critical component of effective communication, as it closes the loop in the communication process and affirms to the sender that the message was received and understood. By assuring her manager that she would make fewer errors, Marcela used feedback to indicate that she decoded the message and was committed to improving her job performance.