Which of the Following Statements Is Correct

Which of the following statements is correct?

A) The declination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field.
B) The declination of the Earth's magnetic field is the angle between a vertical plane and the direction of the field.
C) The inclination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field.
D) The inclination of the Earth's magnetic field is the angle between the horizontal component of the field direction and the direction to geographic north.
E) Inclination and declination mean the same thing.