Directions: Consider the given information and answer the three items that follow.
When three friends A, B and C met, it was found that each of them wore an outer garment of a different colour. In random order, the garments are: jacket, sweater and tie; and the colours are: blue, white and black. Their surnames in random order are: Ribeiro, Kumar and Singh. Further, we know that :
1. neither B nor Ribeiro wore a white sweater
2. C wore a tie
3. Singh's garment was not white
4. Kumar does not wear a jacket
5. Ribeiro does not like to wear the black colour
6. Each of the friends wore only one outer garment of only one colour

What is C's surname ?

Correct Option: (a) Ribeiro

Let's analyze the clues for friends A, B, and C with garments {jacket, sweater, tie}, colours {blue, white, black}, and surnames {Ribeiro, Kumar, Singh}. Clue 2 states C wore a tie. Thus, A and B wore either a jacket or a sweater. Clue 1 states: 'neither B nor Ribeiro wore a white sweater.' This implies the person wearing the white sweater is neither B nor Ribeiro. Since C wore a tie, C cannot wear the white sweater. Thus, A must be the one wearing the white sweater. Since A wore the white sweater, and Ribeiro did not wear the white sweater, A's surname is not Ribeiro. We also know B is not Ribeiro (neither B nor Ribeiro). Thus, C's surname must be Ribeiro. Now, C's surname is Ribeiro, and he wore a tie. Since Ribeiro does not wear black (Clue 5) and cannot wear white (as A wore white), C's tie must be Blue. B must wear the jacket (since A has the sweater and C has the tie), and B's colour must be Black. Since Kumar does not wear a jacket (Clue 4), B's surname is Singh and A's surname is Kumar. Hence, C's surname is Ribeiro.