Concept: This is an analogy question that compares a bigger group with one of its members.
Explanation:Musa (AS) is one of the Anbiya, meaning the Prophets.
In the same way, Khulafaur-Rashidun refers to the rightly guided Caliphs after Prophet Muhammad (SAW).
The four Khulafaur-Rashidun are Abu Bakr, Umar, Uthman, and Ali.
Uthman b. Affan is among these four caliphs.
Therefore, the correct match for Khulafaur-Rashidun is Uthman b. Affan.
The other names given are not among the four rightly guided caliphs.
Answer: A. Uthman b. Affan