In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[Q]: A man demonstrates how to walk across and navigate a slackline in a grass courtyard in front of apartments. the man <sep> (A) demonstrates how to traverse a low brick fence on a residential street. (B) walks slowly across the slackline while talking and stopping to talk to passerbys. (C) stands on a slackline balancing himself with his arms before the clip cuts to him interviewing. (D) poles backward, glasses on and he begins to walk while holding the slackline while walking across the courtyard.
[A]: C

[Q]: The boy watches his mom vacuum as he jumps on the bed. The boy then lays down on the bed as he sees his mother finish the job. then the boy <sep> (A) shows his stomach as she vacuums the bed. (B) plays the accordion and pans the camera to his dad playing the accorion. (C) plays with some toys and walk down a street as he looks at a lot of houses. (D) gets off the bed and jumps down to the ground to look under the bedside table.
[A]: D

[Q]: [header] How to measure mass [title] Know that f (force) = m (mass) * a (acceleration). [step] This simple equation is what you'll use to convert weight into mass (or mass into weight, if you want to). Don't be worried about what the letters mean-we'll tell you : [substeps] Force is the same thing as weight. <sep> (A) Co (force) is the same thing as mass. N (force) is another thing to consider. (B) We convert this to mass with the same exponent in pounds. [title] Measure weight in ounces before eating junk food. (C) We will stand in a crowded elevator and say to ourselves " m (force) + u * u. r = r (( acceleration) + u "] or " l " again if you want to math and multiply mass by mass. (D) Use newtons (n) as weight. Mass is what you're solving for, so it may not be defined to begin with.
[A]:
D