Final answer:
The term 'idiosyncratic' best describes having an odd quirk, as it refers to peculiar or individual characteristics that are distinctive to a person. None of the other options provided—exuberant, felicity, or frugal—specifically align with the concept of an odd quirk.
Step-by-step explanation:
When describing someone as having an odd quirk, we are referring to a characteristic or a behavior that is peculiar to that person. It's something that sets them apart from others. In the context of the options provided, idiosyncratic is the term that fits this description. To explain further:
- Exuberant refers to being full of energy, excitement, and cheerfulness.
- Felicity is a state of happiness or the ability to find appropriate expression for one's thoughts.
- Idiosyncratic means having peculiar or individual characteristics that are distinctive to a person.
- Frugal means being sparing or economical with regard to money or food.
In this sense, idiosyncratic clearly aligns with the notion of an 'odd quirk' as it specifically denotes individual traits or behaviors which are unusual or unique to a person.
Therefore, the multiple-choice question (MCQ) answer to 'Which of these terms is best described as having an odd quirk?' is c. Idiosyncratic.