I think its either C or D. I tried, couldn't figure the last part out. Hope this helped though!! Have a great day! :D
Thr wave of sound that makes the truck is vibration
300
Explanation:
100 x 3 =300 simple and easy
C is the awnser because c is single replacement
A) 5 kg block of wood
B) 100 kg person
C) 412 kg motorcycle
D) 2540 kg elephant
Answer: D
