The correct answer is: D. Radha said, “Our manager might go to Bombay tomorrow.”
Radha said that the manager would go to Bombay the next day. This means that Radha believes that the manager is likely to go to Bombay the next day, but she is not certain. This is consistent with the sentence “Our manager might go to Bombay tomorrow.” This sentence expresses a possibility, but it does not make a definitive statement.
The other options are incorrect because they do not express a possibility. Option A, “Radha said, ‘Our manager will go to Bombay tomorrow,'” is a definitive statement. Option B, “Radha said, ‘Our manager will be going to Bombay the next day,'” is also a definitive statement. Option C, “Radha said, ‘Our manager might be going to Bombay the next day,'” is a possibility, but it is not as strong as the possibility expressed in option D.