AThe correct thickness is the maximum thickness at which no resistance is felt when the blades are withdrawn from the clearance
BThe correct thickness is the maximum thickness at which a slight amount of drag is felt when the blades are withdrawn from the clearance
CThe correct thickness is the maximum thickness which can be inserted into the clearance to be measured
DThe correct thickness is the maximum thickness at which a considerable amount of drag is felt when the blades are withdrawn from the clearance