Which statement correctly pairs the proctor method with its method number?

• A. Standard Proctor: AASHTO T-99; Modified Proctor: FM 1 T-180
• B. Standard Proctor: FM 1 T-180; Modified Proctor: AASHTO T-99
• C. Standard Proctor: AASHTO T-99; Modified Proctor: AASHTO T-180
• D. Standard Proctor: ASTM D698; Modified Proctor: FM 1 T-180

Answer: (A)

Proctor tests come in two levels of energy to determine how compact a soil can be, and each level has a specific method number assigned by testing standards. The standard Proctor is paired with AASHTO T-99, while the Modified Proctor uses AASHTO T-180. This pairing reflects the two commonly used, organization-consistent references for the test types. The other options mix organizations or swap the method numbers, which isn’t how the standard pairings are defined, so they don’t fit as correctly.