The correct answer is (B) To bring into musical accord. To tune; to harmonize; to bring a musical instrument into harmony. To adjust; to bring into accord or sympathetic relationship; to make one thing suit or agree with another.

Attune comes from Latin ad (to) + tune.

Examples of use:

• He is attuned to living in a rural area.
• Be sure to attune your presentation to the interests of your audience.