From the given options, select the pair of words which carries the same relationship to the given pair of words:

Dull : Bright

Harmony : Discord

The correct answer is Option 4: Harmony : Discord

The relationship between "Dull" and "Bright" is that they are antonyms – words with opposite meanings. "Dull" implies a lack of vividness or excitement, while "Bright" implies vividness and illumination.

Let's examine the options:

Option 1: Forsake : Discard - These words are synonyms, both meaning to abandon or get rid of something.

Option 2: Lean : Slender - These words are synonyms, both describing someone or something thin.

Option 3: Fragile : Delicate - These words are synonyms, both describing something easily broken or damaged.

Option 4: Harmony : Discord - These words are antonyms. "Harmony" refers to a pleasing arrangement or agreement, while "Discord" refers to a lack of agreement or harsh sounds.