Abstract nouns are essentially nouns that can be interpreted differently by different individuals, such as beauty or maturity. Going by this definition, the abstract noun in the given sentence should be "loyalty".
The analogies are the following:
1. Cause to effect: digestion - eat
2. Part to whole: organs - body
3. Word to antonym: day - night, word to synonym: serene - calm
4. Object to characteristic: sun - shine
5. Time sequence: marriage - children
6. Spatial order: garage - car
If the underlined area is “more dark” then the answer is D
B. The punctuation belongs outside of the parenthetical citation.
