What does 'stimulus generalization' mean?

What does 'stimulus generalization' mean?

• A. Occurs when a new stimulus that is presented has features or similar characteristics with that of the taught stimulus and the learner responds to the new stimulus in the same way
• B. Occurs when a learner emits a different response that what was trained
• C. Occurs when reinforcement is removed
• D. Overgeneralization

Answer: (A)