Correct option is B
The correct indirect form of the sentence is "He said that Manan had come to college the previous day."
Direct speech- Direct speech, also known as quoted speech or direct quotation, is a way of reporting someone's exact words.
Indirect speech- Indirect speech, also known as reported speech or indirect quotation, is a way of reporting someone's words or thoughts indirectly, without using their exact words.
When converting direct speech to indirect, comma inverted commas are replaced with conjuction “that”, the tense changes from simple past (came) to past perfect (had come), and 'yesterday' changes to 'the previous day'.