Which of these two dimensional array are advantageous to use and why?

Question

In a facebook group, I saw a question like :

If a row dominated two dimensional array in the following which one is advantage and why?

Answer 1

According to me The Correct One is 'A' :Because when we use array of 2-D it is easy for assessment Of element Row by Row to cache ,than Column by Column, Since Cache is used for fast Assessment ,if more hit than it behaves fast so first one is Correct, Thanx Have a nice day.