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Ms. Mayo challenged her students to build a pendulum that would hit a block of wood and make it travel the farthest distance. The group that moved the block of wood the most would win a prize. One group's experimental data is shown above.
What comment would you make about the group's manipulated variable?
A) The manipulated variable is the mass of the pendulum bob.
B) The manipulated variable is the distance the wood block moves.
C) They incorrectly used two manipulated variables; you can only use one at a time.
D) They correctly changed the mass of the bob and the length of the string at the same time.