The first line is uncertain. A is one or four cards. When using a card, because the logarithm of A and C together is the least, when C is two and a pair at the same time, A will appear when A is a single card. A and C have the least logarithm together, and the same is true when C is used. B will also happen, not sure!

The second way: D, you can push it, because A and C are the same age, and D and E belong to different age groups. Then A and C must be younger than 30 years old, and because B and E have the same occupation, C and D have different occupations, B and E are both secretaries, leaving only D!