What is the formula for determining the modulus of elasticity of conc

1.	What is the formula for determining the modulus of elasticity of concrete as per ACI?
A.	E=4500\(\sqrt{f_{ck}}\)
B.	E=5500\(\sqrt{f_{ck}}\)
C.	E=4700\(\sqrt{f_{ck}}\)
D.	E=5000\(\sqrt{f_{ck}}\)
Answer» D. E=5000\(\sqrt{f_{ck}}\)

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