Which of the following is not an example of doing work?

a. holding a tray in the cafeteria line
b. picking up a box off the floor
c. raising a barbell over your head
d. pushing a box across the floor

i will give brainliest to the first person who answers if they get it right
plz

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

What is the magnitude of the resultant vector round your answer to the nearest tenth

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e