Correct Answer: The ease of converting a currency into another currency
  

Solution : The correct answer is (a) The ease of converting a currency into another currency.

In the foreign exchange market, liquidity refers to the ability to buy or sell a currency quickly and easily without causing significant price movements. It is a measure of how easily a currency can be converted into cash or other currencies. Currencies with high liquidity are actively traded and have a large number of market participants, which means there is a higher volume of transactions and a narrower bid-ask spread.

Liquidity is an essential aspect of the foreign exchange market because it ensures efficient price discovery and smooth execution of trades. High liquidity enables market participants to enter and exit positions without significant slippage or impact on the exchange rate. It also allows for tighter spreads, reducing transaction costs for traders.

Factors that can influence the liquidity of a currency include the size and depth of the market, the number of participants, trading volume, and the presence of market makers. Major currencies like the US dollar, euro, Japanese yen, British pound, and Swiss franc typically have high liquidity due to their wide acceptance and extensive trading activity.