Final answer:
A dipper stick or leveling rod is used to check the depth of an excavation when using a builder's level. Hence the correct answer is option A and B
Step-by-step explanation:
When using a builder's level to check the depth of an excavation, a dipper stick or leveling rod is typically used.
A dipper stick is a long pole with depth markings on it. It is inserted into the excavation until it reaches the bottom, and the depth can be read off the markings.
A leveling rod is a telescopic rod that can be extended to reach the bottom of the excavation. It also has depth markings for reading the depth.
Hence the correct answer is option A and B