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

A concrete structure is set on fire and the temperature raises to 1000

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