Bitumen of grade 80/100 means
(A) Its penetration value is 8 mm
(B) Its penetration value is 10 mm
(C) Its penetration value is 8 to 10 mm
(D) Its penetration value is 8 to 10 cm
(A) Its penetration value is 8 mm
(B) Its penetration value is 10 mm
(C) Its penetration value is 8 to 10 mm
(D) Its penetration value is 8 to 10 cm