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This option captures the main idea of the passage that some codes, like language and visual signs, are so commonly used that they appear natural and conceal the process of how they were created.
Option a: The passage does not suggest that early learning is why codes appear natural. The cause-and-effect relationship is incorrectly stated here.
Option b: This option misinterprets two key aspects of the passage. First, the idea that certain codes are "made to appear universal" is somewhat misleading because the passage doesn't claim that codes are deliberately made universal; instead, it describes how codes, through habituation and widespread use, come to feel "natural". Second, the phrase "Ideology aims to hide the mechanism of coding" is not supported by the passage.
The passage suggests that the naturalization of codes leads to the illusion of transparency and naturalness, which conceals the mechanisms of coding, but it doesn't explicitly discuss ideology as a force that intentionally hides these mechanisms
Option d: This option is incorrect because the passage doesn’t claim that all codes have a natural origin. It states that codes become naturalized through use, not that they were naturally originating from the start.
Hence, option c is the correct answer.