Answer :
Final answer:
The correct ASTM standard for obtaining samples of concrete for molding test specimens is ASTM C192.
Explanation:
The correct answer is ASTM C192. In materials science and engineering, ASTM standards are widely used to ensure the quality and consistency of construction materials. ASTM C192 specifically outlines the method for obtaining samples of concrete for the purpose of molding test specimens. This standard provides instructions on how to collect, handle, and prepare representative samples of concrete to be used in various tests and analysis.