Stolidity means to be unmoved or resolute (in a negative sense) without listening to the arguments. Posterity means 'for the future' Proximity is a term used to describe how near a place is with reference to something. Agility is a term used to describe the ability to move quickly Sobriety is a term used to describe the state of being sober or to process thing rationally. Sobriety is opposite in meaning to stolidity. Therefore, option D is the right answer