Final answer:
On 'Who Wants to Be a Millionaire', the worst choice for a lifeline would be an uninformed individual because they lack the necessary knowledge to assist in answering questions.
Step-by-step explanation:
If you were on Who Wants to Be a Millionaire, the last person you'd call as a lifeline would be d. Uninformed individual. On the show, contestants are provided with lifelines to assist them in answering difficult questions. Calling an uninformed individual would not be beneficial because they are likely to lack the knowledge needed to help answer the question correctly. Instead, you would want to call a knowledgeable individual, wise person, or an informed friend who could provide accurate and helpful information, increasing your chances of winning the Millionaire grand prize.