What is the reason for the higher flexural strength values obtained from ASTM C78 compared to the true tensile strength of concrete? Question 5Select one: A. The size of the beam specimens used in the ASTM C78 test. B. The geometry of the specimens used in the ASTM C78 test. C. Equations used in ASTM C78 are based on a linear elastic behavior for concrete. D. Equations used in ASTM C78 are based on a non-linear behavior for concrete