Correct option is A
verbally explain the information
For a student with visual impairment, the teacher should verbally explain the information. This approach makes the content accessible to the student and ensures they can participate in the learning process. Showing charts or using sign language wouldn't be effective for a student with visual impairment. Frequent eye contact, while generally a good teaching practice, doesn't specifically aid a visually impaired student. Verbal explanations, possibly supplemented with tactile materials or auditory aids, are the most effective teaching methods for these students.