As Bubba’s Bubble Gum Company adds workers while using the same amount of machinery, some workers may be underutilized because they have little work to do while waiting in line

As Bubba’s Bubble Gum Company adds workers while using the same amount of machinery, some workers may be underutilized because they have little work to do while waiting in line to use the machinery. When this occurs, Bubba’s Bubble Gum Company encounters
A)economies of scale.
B)diseconomies of scale.
C)increasing marginal product.
D)diminishing marginal product.