Step 1: Understanding Concurrent List
The Concurrent List is provided under Schedule VII of the Indian Constitution. It contains subjects upon which both the Centre and States can legislate.
Step 2: Number of Items in Concurrent List
Currently, the Concurrent List contains 47 items. Initially, the Concurrent List had fewer subjects, but through amendments, the number settled at 47 items. Both the Parliament and State legislatures can make laws on these items, but in case of a conflict, the central law prevails.
Therefore, the correct answer is option (3): 47 items.