What is the colour of the tie ?

Correct Option: (b) Blue

Using the deduction from the puzzle, we have successfully mapped all attributes of the three friends: 1. A's surname is Kumar; he wore a White Sweater. 2. B's surname is Singh; he wore a Black Jacket. 3. C's surname is Ribeiro; he wore a Blue Tie. Let's verify how we arrived at the colour of the tie. C wore a tie (Clue 2). The available colours are Blue, White, and Black. Since A wore the white sweater, the colour white is taken. This leaves only Black and Blue for the jacket and the tie. Clue 5 states that Ribeiro does not like to wear the black colour. Since C's surname is Ribeiro, C cannot wear black. Therefore, the colour of C's tie must be Blue. Consequently, the jacket worn by B (Singh) must be Black. This satisfies all given conditions without any contradictions. Thus, the colour of the tie is Blue.