Final answer:
Gloss/o and lingu/o both mean language. These roots are linked to the study and structure of human communication and when included in different words, they reflect the complex system enabling people to express and understand concepts.
Step-by-step explanation:
Gloss/o and lingu/o are both root words used in the English language that pertain to language. When these roots appear in various words, they reference aspects related to the communication and comprehension used by different communities. For example, linguistics is the study of language, including its structure, development, and relationship among languages, which reflects the breadth and complexity inherent in human communication. Another example is bilingual, which refers to a person who is proficient in two languages, incorporating the root lingu.
The combination of a language's lexicon and its grammar creates a system that enables people to convey complex ideas, emotions, and information effectively. Considering this, the terms gloss/o and lingu/o are central to numerous aspects of language studies, including geolinguistics and the general exploration of how dialects can vary within a single language, potentially impacting mutual intelligibility.
To sum up, gloss/o and lingu/o both mean language, making the answer to the question (c).