Final answer:
The given characteristics, 'sprightly and agile' and 'changeable and fickle,' describe traits often associated with characters in literature. The subject, likely from the field of English literature, appears to be that of a character who exhibits both consistent and variable traits, therefore the answer is both A and B.
Step-by-step explanation:
The characteristics of the given subject could refer to descriptions from several academic disciplines; however, based on the vocabulary provided (sprightly and agile, changeable, and fickle), it seems that the subject in question might be related to literature, particularly the description of characters. In English, particularly in literature and character analysis, these terms are employed to depict character traits.
'Sprightly and agile' can be associated with a character that is lively and quick in movement or action. 'Changeable and fickle' might describe a character whose behavior is not constant and can quickly change mood or loyalty. If these descriptors are combined, the subject is likely a character who exhibits both sets of traits. Therefore, the answer to the question would be 3) both A and B.
Subjects in English and character analysis often explore the stability or variability of personalities within literature. When analyzing characters, you'll encounter static/flat characters who do not change, and dynamic/round characters who do change over time. This is central to understanding character development and thematic elements within a story.