What is the difference between variation and declination in navigation terms?

What is the difference between variation and declination in navigation terms?

• A. They are often used interchangeably to describe magnetic variation; the distinction is regional, but both refer to the angle between true north and magnetic north.
• B. Variation is used only in charts, declination only in celestial navigation.
• C. Variation is the angle between true north and magnetic north, while declination is the angle of tidal current.
• D. Variation and declination refer to speed and depth.

Answer: (B)