The correct answer is B. Combining sentences to use complex structure
Explanation:
In writing and speaking, fluency is used to describe the quality of texts and speeches to presented ideas in a smooth way which implies the audience can understand all ideas and go from one idea to the other without gaps or brakes. This is achieved through multiple elements that including organizing ideas appropriately, using linking words between ideas and combining sentence in a complex structure because in many cases the use of short sentence separates important points into multiple chunks that might be difficult to understand as a whole. Considering this, the definition of fluency is "Combining sentences to use complex structure", because this is one of the main ways ideas are integrated and therefore there is an appropriate fluency or cadence in a text or speech.
