
If two similar waves are traveling in the same medium, then they have same wave velocity. so we can infer that

Now, as per the formula ~ we know that :

Now, we can write it as :

And it's also given that frequency of wave A is 3 times that of frequency of wave B.
So, let's add the relation to our equation ~



So, choice C is correct ~
I would go with B, parliamentary procedure
Answer: Duncan sentences Cawdor death and tells Ross to give Macbeth the new title Thane of Cawdor. Act 1 Scene 3 The witches meet Macbeth and tell him he will be Thane of Glamis, Thane of Cawdor and king.
Explanation: Hope this helps!!
The answer would be “physics”