Starting from a Point of Tangency Between an Isoquant and an Isocost

Multiple Choice

Starting from a point of tangency between an isoquant and an isocost line, a movement along the isoquant will

A) increase output but have no effect on cost
B) decrease output but have no effect on cost
C) increase both output and cost
D) have no effect on output but increase cost
E) have no effect on output but decrease cost