Final answer:
The individual (a) lost their appetite due to snacking before dinner, impacting their decision to skip the meal.
Step-by-step explanation:
The sequence implies that the individual lost their appetite because they snacked before the meal, as suggested by someone advising against snacking before dinner. The declaration "I'll forego dinner. "I lost my appetite" denotes a lack of desire to eat, most likely as a result of previous snacking. This exchange highlights the consequence of eating snacks before a meal, leading to a decreased desire for the main dinner.
Therefore, the context supports the idea that the loss of appetite is linked to having snacks beforehand, aligning with option (a).