The correct answer is: B. who
The sentence is about Ganesha, a Hindu god who is often depicted with a mouse as his vehicle. The word “who” is used to refer to people or things that are known or identified. In this case, Ganesha is known to be a god who lives in heaven and has a mouse as his vehicle. Therefore, the word “who” is the most appropriate word to use in this sentence.
The other options are not as appropriate because they do not accurately reflect the information that is given in the sentence. The word “whose” is used to refer to the owner or possessor of something. In this case, the sentence does not provide any information about who owns or possesses Ganesha. The word “that” is used to refer to things that are not known or identified. In this case, the sentence provides information about Ganesha, so the word “that” is not the most appropriate word to use. The word “he” is used to refer to males. In this case, the sentence does not provide any information about the gender of Ganesha, so the word “he” is not the most appropriate word to use.