B. **Simplicity:** The critic is claiming that the novelist's prose is not simple, contrary to its reputation. This suggests that the novelist is not known for straightforward or easy-to-understand writing. Therefore, "simplicity" is fitting as the opposite characteristic.

D. **Artlessness:** Similar to simplicity, "artlessness" implies a lack of artifice or complexity. If the critic is asserting that the novelist's prose is not straightforward despite its reputation, then "artlessness" aligns with the idea that the writing is not devoid of artistry or complexity.

A. **Scrupulousness:** This term suggests being careful, thorough, and exact. If the critic is claiming that the prose is full of opaque language games, it implies a lack of clarity rather than an excess of carefulness.

C. **Mendacity:** This term refers to dishonesty or untruthfulness. While it might indicate a lack of straightforwardness, it doesn't quite capture the nuance of complex language games in the same way "artlessness" does.

E. **Polish:** This term typically conveys a high level of refinement and smoothness. If the critic is pointing out opaque language games, it implies a certain roughness or lack of smoothness in the prose, making "polish" less suitable.

F. **Meticulousness:** This term indicates great attention to detail and precision. If the critic is emphasizing opaque language games, it suggests a deliberate use of complexity rather than meticulous attention to clarity.

In summary, options B (simplicity) and D (artlessness) are the most fitting opposites to the idea that the novelist's prose is full of opaque language games despite its reputation.

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