Option 1 -> The passage doesn't mention he was unfamiliar with the Tata Group.
Option 2 -> Opposition to traditional methods is not cited as a reason for initial doubts.
Option 3 -> The passage explicitly states he was "relatively young" at 53 and "had no major achievements to inspire confidence."
Option 4 -> There's no indication he was unwilling to take on the chairmanship.
Hence, Option 3 -> The passage clearly mentions that Ratan Tata's selection "raised doubts about his capabilities and acceptability, especially among the older leadership" because he was relatively young and "had no major achievements to inspire confidence" at the time of his appointment -> correct