Live Prompt: Redesigning a Grocery App's Delivery-Slot Picker

New live prompt: "Our grocery delivery app's checkout has a step where users pick a delivery time slot before paying. Support tickets show many users complain the available slots are 'confusing' and abandon at this exact step. You have 20 minutes — walk me through your approach."

1. What clarifying questions would you ask, given the evidence here is support tickets (qualitative complaints) rather than quantitative funnel data — how does that change your first move compared to the main case study, where a hard percentage was already given?
2. Generate 3 distinct hypotheses for what "confusing" could actually mean in a delivery-slot picker, translating a vague complaint into specific, testable design problems.
3. Sketch a redesigned slot-picker interaction, tying each decision to a named principle from interaction design or visual design.
4. What's the fastest way to validate which hypothesis is actually right before redesigning?