It was difficult to see through the . . . . . . . . of the head lights of the cars.

The correct answer is B. glare.

• Shine is the emission of light.
• Glare is a strong, unpleasant light that makes it difficult to see.
• Dazzle is a sudden, bright light that temporarily blinds or confuses someone.
• Brilliance is the quality of being very bright.

In the context of the question, it was difficult to see through the strong, unpleasant light of the headlights of the cars. This light is called glare.