Explanation:

To answer this question, we need to analyze the given options and determine who could have come with Kalyani, Shreedhar, and Shailaja. Let's look at each option:

a) Dada: Dada refers to an elder brother in some cultures. However, the question does not provide any information about an elder brother accompanying the three individuals mentioned. Therefore, option 'a' can be eliminated.

b) Parents: This option suggests that the parents of Kalyani, Shreedhar, and Shailaja could have come with them. While it is possible that parents could accompany their children, the question does not provide any specific information about their parents. Hence, we cannot definitively select option 'b'.

c) Teacher: This option proposes that a teacher could have come with the three individuals. Again, there is no mention of a teacher accompanying them in the question. Thus, option 'c' can be ruled out.

d) Didi: Didi refers to an elder sister in some cultures. Since the word 'Didi' is capitalized, it suggests that it may be a proper noun or a name. It is possible that 'Didi' could be the name of someone who accompanied Kalyani, Shreedhar, and Shailaja. Therefore, option 'd' seems to be the most plausible choice.

Conclusion:

Based on the analysis of the given options, it can be inferred that 'Didi' is the most likely person who came with Kalyani, Shreedhar, and Shailaja.