_For highway geometric design purposes the speed used is$?

• A. 15th percentile
• B. 50 ‚Äö√Ñ√∫‚Äö√Ñ√πpercentile
• C. 85th percentile
• D. 98 ‚Äö√Ñ√∫‚Äö√Ñ√πpercentile