The diagrams below show waves interfering as they move through the same medium at the same time. Which of the wave interactions would best represent constructive interference of sound waves produced by musical instruments?

wave interaction a

wave interaction b

wave interaction c
wave interaction d

i would think it's food chain

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

iron would move it is magnetic there is a mag field around the current in the wire