In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

[header] How to write phonetically [title] Figure out vowel features. [step] All vowels are voiced. Vowels are defined by the height of the tongue in the mouth (high, mid, low) and its position with regard to the lips (front is towards the lips, back is away). <sep> (A) [title] Find out what expression expressions mean to the individual. [step] There are three main expressions (expression) and vowels: facial expressions, expression expression, expression expression, expression and expression. (B) The tension in muscles when the sound is made (tense or lax) and rounding of the lips (rounded or spread) are also significant when distinguishing one vowel from another. [substeps] In the received pronunciation accent of english, there are 12 pure vowels and 8 diphthongs (also called gliding vowels). (C) Vowels are also pronounced in the lower registers, which are located just below the upper registers of the tongue. Vowels are pronounced at any time of the day. (D) Vowels are defined by any vowel (lower, high, middle, and lower). Vowels can sound much more nasal and nasal than lip-states.
B