The question asks which Indian judge was presently serving as a member of the International Court of Justice at the time this examination was set. Let us look at the four names and their actual relationship to the ICJ.
Since Justice Bhandari was the Indian judge actually sitting on the Court at the relevant time, while Justice Nagendra Singh's tenure belongs to an earlier era and the other two names were never ICJ members at all, the correct answer is Justice Dalveer Bhandari.