The core concept is understanding synonyms. 'Perceive' means to become aware of something through the senses. Option C 'notice' which is 'to become aware of' is the closest in meaning. Option A 'ignore', means 'to deliberately not pay attention', the opposite of perceiving. Option B 'overlook', which means to miss something', is the opposite of perceiving. Option D 'forget' meaning 'no longer remember' is also unrelated. Therefore the correct answer is C.