What is the most cost-effective way to accurately measure the height of a ceiling when ladder use is not allowed?

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What is the most cost-effective way to accurately measure the height of a ceiling when ladder use is not allowed?
A . Use a laser measure to measure the distance from the floor to the ceiling
B . Gather measurements from other objects and do the math
C . Estimate the height based on known object sizes
D . Rent a lift-cart to lift you up to the ceiling

Answer: A