The Mariner's compass always points towards the _______________.
a. North
b. South
c. East
d. West

Hint: A very significant navigational instrument has always been. The Mariner’s compass l. It allows sailors to know which direction they are sailing towards. It was invented by Francis Crow and used by the Royal Navy during the 1830s.

Complete answer: The Mariner’s compass always points towards the North.
A Marine compass is the dome-shaped bulb compass used by many sailors, it has a dial that rotates on a pivot (a land compass is generally circular in shape and flat like a pocket watch, occasionally it is attached to a flat base. It usually has a north/south needle that rotates freely). Modern compasses usually use a magnetized needle or dial inside the compass filled with a liquid.
It is mainly used for navigational purposes by traders, merchants, and the navy.
Therefore, Option A is correct.

Note: An English inventor, Gowin Knight, invented a method of magnetizing steel in 1745 in such a way that it would maintain its magnetization for long periods of time; his improved compass needle was bar-shaped and wide enough to hold a cap through which it could be placed on its pivot. The Knight compass has been used extensively.