Transactions of a company involving external sources of funding are referred to as: Investing activities. Operating activities. Financing activities. External activities.

The correct answer is letter "C": Financing activities.

Explanation:

Financing activities refer to all funds a company obtains from outside resources of the firm to keep the business up and running or to invest in new ventures that could represent profit opportunities. By doing this, the firm acquires creditors affecting its long-run liability and equity.