The word 'vivid' means producing powerful feelings or strong, clear images in the mind. It is associated with being bright, intense, and colorful.
Synonyms for 'vivid' would include bright, clear, and colorful. Options (A), (C), and (D) are all similar in meaning to 'vivid'.
The antonym (opposite) would be a word that means lacking brightness, intensity, or clarity.
The word 'dull' means lacking interest or excitement, and also lacking brightness or vividness in color.
Therefore, 'dull' is the best antonym for 'vivid'.