How does aunt fumika display for her heritage?

The readability of a written document is determined by both sentence clarity and document formatting; use concise language and clear headings to improve the readability of your message’ is a correctly written compound sentence.  

Option B

Explanation:

Compound sentences are the ones which has more than one independent clause and that are formed by either conjunctions, (and, but, yet.. etc) semicolon(;) or just comma (,) Independent Clause as the name suggests are the type of sentence which can stand alone and can form its own sentence.For example,  in the sentence: ‘The readability of a written document is determined by both sentence clarity and document formatting; use concise language and clear headings to improve the readability of your message’, there are two independent clause- one which appears before the semicolon and the other after the semicolon thus making it a compound sentence.