Right choice is (b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture
Easiest explanation: The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture is called equivalent flexural strength.