A strip of thickness 40 mm is to be rolled to thickness of 20 mm using a two-high mill having rolls of diameter 200 mm. coefficient of friction and arc length in mm, respectively are

• A. 0.45 and 38.84
• B. 0.39 and 38.84
• C. 0.39 and 44.72
• D. 0.45 and 44.72