The correct answer is (D) To tie (particularly grazing animal) with a rope, chain, etc. to preventing from running or straying from. To fasten by, or confine with, a tether.

Tether comes from Middle English tethir, Old Norse tiódhr, tjóthr.

Examples of use:

• She tethered her goat to prevent it from straying.
• They tethered their horses to the wooden railing.