Which of the following is a valid deductive argument?

• All cyclists are health-conscious. Byron is health-conscious. Therefore, Byron is a cyclist.
• Smith is one of the most common last names in the United States. My friend Todd is a very common person. Therefore, Todd's last name is Smith.
• Every time it snows, the roads need to be plowed. It is supposed to snow later today. Therefore, the roads will need to be plowed later today.
• For over five decades, fantasy fiction has been very popular. It will probably continue to be popular in the coming decade.