Answer:
"They had made no advance arrangements to travel from Kholby to Allahabad."
Step-by-step explanation:
The detail from the passage that best supports the conclusion that the traveling companions were surprised by the transportation delay in India is:
"They had made no advance arrangements to travel from Kholby to Allahabad."
This statement suggests that they did not plan for the delay and had to deal with the situation unexpectedly, indicating their surprise.