Select the most appropriate SYNONYM of the given word.

Conceal

Hidden

The most appropriate synonym of the word "conceal" is hide.

• Conceal means to hide or keep something from sight.
• Hide means to put or keep something out of sight.

The other options have different meanings.

• Reveal means to make something known or visible.
• Open means to make something accessible or available.
• Discover means to find something that was previously unknown or hidden.

So, the answer is Option 4: Hide.