A concrete structure is set on fire and the temperature raises to 1000°C. The strength of concrete as compared to original strength reduces to

A concrete structure is set on fire and the temperature raises to 100

1.	A concrete structure is set on fire and the temperature raises to 1000°C. The strength of concrete as compared to original strength reduces to
A.	10 %
B.	15 %
C.	20 %
D.	25 %
Answer» D. 25 %