Glow

[Note: This is a previous year's question and seems to have some ambiguity]

Option B is the correct answer as it is inappropriate. Embarrassment typically doesn't lead to a "glow," as it suggests a more negative or awkward emotion. The usage of glow in this sentence is not appropriate.

Option A: In this sentence, "glow" describes a radiant expression of pride. The word "glow" here is appropriate because it implies a positive, warm, and shining emotion, which fits well with pride.

Option C: This is a correct usage. A bonfire emits a warm light, and the word "glow" is used to describe the light that the fire gives off, illuminating its surroundings

Option D:  Sullenness refers to a gloomy, ill-tempered, and resentful state of mind or disposition. Here, it should be a "lack of glow' that would indicate sullenness.