Answer:
B) 15 decision variables, 8 supply/demand constraints.
Explanation:
To determine the number of decision variables all we have to do is multiply the number of groves by the number of processing plants = 3 x 5 = 15. There are 15 possible ways that oranges can go from one specific grove to one specific processing plant.
To determine the supply/demand constraints we add the number of groves (supply) and processing plants (demand) = 3 +5 = 8