Correct Answer: Potable

Solution : The correct option is the fourth option.

Potable means safe or suitable for drinking. It refers to something suitable for consumption, especially in terms of liquids.

The meanings of the other options are as follows:

• Ostensible: Something that appears to be true but may not necessarily be so.
• Deplorable: Deserving strong condemnation; shockingly bad.
• Liable: Responsible by law or likely to do something, often used in a legal context to denote accountability or legal obligation.

Therefore, the correct answer is potable.