Given the task definition and input, reply with output. 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 measure language competence [title] Develop specific scales for language competence. [step] Because the idea of developing language skills in a certain language is so subjective, it's usually necessary for the instructor or other person who is measuring language skill to set up an arbitrary, but very important, quantitative scale. [substeps] Attach numbers to your language competence scale. <sep> (A) Most of the time, at least five numbers go in a certain direction. If that number is higher or lower than that, then you've already established how many points that number makes on a given scale. (B) Putting numbers in place identically increases the inaccuracy of the scale. Transfer numbers to your " language " scale and many others. (C) Many individuals will start with a simple scale from 1 to 10. This is a starting point for identifying and using the kinds of criteria you need to measure language competence in a person or group of people. (D) To perform this, simply add together each single number in the form of a single digit. Place the sum of these factors on the bottom of the scale.

C