Answer:
Option A. The amount by which a company's value exceeds the value of its individual assets and liabilities
Explanation:
The reason is that goodwill not only measures the business valuable tangible and intangible assets but also the intangible assets that can not be valued which the company has earned due to its business operations, this includes customer loyalty, key employees, brand's value, etc.
This is the reason why the value of the company's aggregate assets are always above the aggregate market value of assets not sold altogether. Hence the option A is correct here.