Answer:
B. Express Opinions
Explanation:
People write letters to editor for various reasons. However, it's mainly an opportunity to lend a voice, that is, to express opinion about topical issues or issues relating to them, such as government, or their immediate environment like schools, markets, prices of goods etc.
In some cases, it may be an opinionated letters in response to an editorial or article that was published previously, so as to give either a supportive or contrary opinion.
