In economics, the short run is the time frame in which and the long run is the period of time in which . A. the quantities of all factors of production are variable but technology is fixed; sunk costs are variable B. the quantities of some factors of production are variable; the quantities of all factors of production are fixed C. the quantities of all factors of production are fixed; the quantities of all factors of production can be varied D. the quantities of some factors of production are fixed; the quantities of all factors of production can be varied