Answer:
A). In this story by Margie McAllister, the piano represents an item of comfort for the main character, Josephine.
Step-by-step explanation:
Thesis statement are described as the statements that primarily intends to reveal the central idea or argument of the literary or research work at the introductory part of the work. The chief aim of such statements is to indicate the central concern(purpose) and scope of the author to the readers and prepare them accordingly.
As per the question, the best thesis statement that reflects the author's concern(purpose) to emphasize a symbol is described through option A as it involves the recurring image of the object 'piano'(used as a symbol) that signifies a more deeper and symbolic meaning by associating it to 'the comfort object for the main character, Josephine'. Thus, option A is the correct answer.