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Answer:
c
Explanation:
because I've had this question before and got it right
Well, you should TAKE COVER UNDER A STUDY DESK, TABLE OR AGAINST AN INSIDE WALL. Which is C. This is because, doing this protects you from the falling objects. If you do A or B, you will probably get crushed by falling objects because you are exposed. Hope I helped.
Answer:
Explanation:
Given
frequency of wave 
We know velocity is given by

where
=wavelength



a,c,d, is your answer I think I hope it helps