The correct answer is B. Microsoft Word.
Step-by-step explanation
A cover letter is a type of letter that is usually sent along with a curriculum vitae or resume and in which the candidate introduces himself or herself and provides reasons to be considered in a job vacant. On the other hand, Microsoft Word is an informatics program for text creation and includes a lot of tools to write, draw shapes, insert images, photos, graphics, maps, among others. This program is usually used to create books, curriculum vitae, summaries, stories and also all letters including cover letters in which text prevails. So, the correct answer is B. Microsoft Word.