Sit-down strikes in which employees occupy their employer's premises are illegal

What is the appropriate term from systems theory for a set of interacting units that endures through time within an established boundary?

A. System D. Environment B. Morphogenesis E. Homeostasis C. Structure

Cash inflows from investing activities would include all of the following except

a. interest collect on notes receivable. b. proceeds from sale of investments accounted for by the equity method. c. proceeds from sale of operating assets. d. proceeds from sale of securities available for sale.