Which of the following skills is NOT assessed in the MoCA Language Arts section?

The skill that is not assessed in the MoCA Language Arts section is mathematical reasoning. The MoCA Language Arts section specifically focuses on various aspects of language arts, which includes reading comprehension, writing clarity, and language function.

Reading comprehension involves understanding and interpreting written texts, while writing clarity assesses the ability to express thoughts clearly and accurately in written form. Language function refers to the use of language in social contexts and the ability to communicate effectively. Since mathematical reasoning pertains to problem solving and numerical skills, it falls outside the scope of language arts, making it the correct choice.