Assets very easily convertible into cash are:

Current assets
Fixed assets
Fictitious assets
Liquid assets

The correct answer is: D. Liquid assets

Liquid assets are assets that can be quickly converted into cash without significant loss of value. Examples of liquid assets include cash, cash equivalents, marketable securities, and accounts receivable.

Current assets are assets that are expected to be converted into cash, sold, or consumed within one year or the operating cycle, whichever is shorter. Examples of current assets include cash, accounts receivable, inventory, and prepaid expenses.

Fixed assets are assets that are used in the production of goods or services and are not expected to be converted into cash within one year or the operating cycle, whichever is shorter. Examples of fixed assets include land, buildings, equipment, and machinery.

Fictitious assets are assets that have no physical substance and are not used in the production of goods or services. Examples of fictitious assets include goodwill, patents, and trademarks.

I hope this helps!