Here, "SUN RISES IN THE EAST" can be decoded using the rule mentioned below:

First Reverse the order of the word.  "SUN RISES IN THE EAST" => "EAST THE IN RISES SUN"

Now count the number of letters exist in each of the word, and add plus 2 in that. 

Hence, The number corresponds to EAST is (4+2) = 6, and the number of  Corresponds to 'THE' is (3+2) = 5, and so on.

Now, in every word take the last letter of it. Hence 'EAST' can be represented as 6T, and 'THE' can be represented as 5E, and so on.

By this logic, "SUN RISES IN THE EAST" can be decoded as 6T 5E 4N 7S 5N

By the same logic, 'RAM GOES TO SCHOOL' can be written as 'SCHOOL TO GOES RAM' => (6+2)L (2+2)O (4+2)S (3+2)M => 8L 4O 6S 5M

The correct option is A