There was a slight, but _____ air of disdain. A: imperceptible B: imperceptibly C: perceptible D: perceptibly

All parties concerned should show respect ____________their power and size, being careful to avoid showing discrimination or disdain to their counterparts. ( )

All parties concerned should show respect ____________their power and size, being careful to avoid showing discrimination or disdain to their counterparts. ( ). A: regardless for B: regardless of C: regardless D: regardless off