The correct answer is A. when the original language is difficult to understand
Step-by-step explanation:
In writing, paraphrasing means to write the ideas of an external source or author in your own words rather than quoting the source. Paraphrasing still implies acknowledging the original author as you are using his/her ideas, but different to quoting you change the original words usually with words and language that fit with your writing style or are easier o the reader to understand. Due to this, paraphrasing is recommended in the case the original language is difficult to understand because by paraphrasing you can change the language without changing the original idea and this would allow your writers to understand better the ideas of the author you are paraphrasing and your ideas.