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<p class="text-sothik text-justified border-bottom"> Answer the questions on the basis of the information given below. A map representing countries R, S, W, X, Y and Z is to be drawn. Adjacent countries cannot be the same color on the map. The only countries adjacent to each other are as follows : * R, S, X and Y are each adjacent to W. * X is adjacent to Y. *R and S are each adjacent to Z.</p> Which of the following is a pair of countries that must be different in color from each other?

1. A R and X
2. B S and X
3. C S and Z
4. D X and Z