In its 2018 Annual Report to Shareholders, Henchman & Co. provided the following Statement of Cash Flows:

Years ended December 31 ($ in millions) Financing Activities Proceeds from issuance of long-term debt Proceeds from equity security units Borrowings under lines of credit Repayment of borrowings under lines of Credit Principal payments of long-term debt/lease agreements Proceeds from issuance of stock Dividends paid Other financing activities Net cash provided by (used in) financing activities Increase in cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year 20181,4916901,173(1,306)(119)825(158)(64)2,532145319$4642017(175)(485)19(114)−(755)177142$319
-Which type of activity (operating, investing, financing) was most responsible for the cash flow experienced by Henchman & Co. during 2018?
Interneurons
Neurons that transmit impulses between other neurons, especially as part of a reflex arc in the central nervous system.
Sensory Neurons
Nerve cells that are responsible for converting external stimuli from the organism's environment into internal electrical impulses.
Motor Neurons
Nerve cells that initiate and conduct signals to muscles and glands, enabling movement and action.
Stem Cells
Undifferentiated biological cells capable of dividing to produce more stem cells or differentiate into various types of cells with specialized functions.