I have just come (1)/ to know that Mr. Ray, one of my favourite (2)/ teachers, died with cancer recently. (3)/ No error (4)

Answer

3

Explanation

die of (something) `rarr` direct cause of death as in - died of cancer. die from (something) `rarr` indirect cause of death as in - died from injuries caused by the accident. Hence, teachers, died of cancer recently is the right usage