Which statement best explains the difference between speed through water and speed over ground?

Which statement best explains the difference between speed through water and speed over ground?

• A. Speed Through Water Is the Position of the Ship Relative to the Earth.
• B. Speed Over Ground Is the Ship's Speed Relative to the Water.
• C. Speed Through Water Is the Vessel's Speed Relative to the Water; Speed Over Ground Is the Ship’s Speed Relative to the Earth, Affected by Currents.
• D. Speed Through Water Equals Speed Over Ground When Currents Are Present.

Answer: (C)