Final answer:
The author's initial experience with working from home is best described as 'Frantic and stressful' due to the heightened conflict between work and family demands.
Step-by-step explanation:
The phrase that best describes the author's initial experience with working from home is B) Frantic and stressful. This is inferred from the passage where the conflict between work and family becomes more intense when working from home, as the proximity of family increases the visibility of their demands.
The author's feelings suggest an overwhelming experience rather than a pleasant or comfortable one, and the use of the word 'frantic' indicates a sense of urgency and chaos, while 'stressful' reveals the tension and pressure the author is under. The correct option is B) Frantic and stressful