Which three trains will take you to Yankee Stadium?

The option that includes the B, D, and 4 trains is correct because these are the train lines that have direct access to Yankee Stadium. The B and D trains can be taken to the 161st Street-Yankee Stadium station, which is the primary stop for anyone heading to the stadium. Additionally, the 4 train also stops at this station, providing another direct route to the venue.

Understanding the geographic layout and train routes in relation to Yankee Stadium is essential for guiding visitors effectively. The other train lines mentioned in the other options do not provide direct service to Yankee Stadium, which makes them less relevant for someone looking to reach that specific location.