ATC has instructed you to intercept the selected radial southwest of the station. Which HSI indicates compliance with this clearance?

To determine which Horizontal Situation Indicator (HSI) indicates compliance with the instruction to intercept the selected radial southwest of the station, it’s important to understand how the HSI displays navigational information.

When intercepting a radial, the HSI shows the aircraft's position in relation to the VOR (VHF Omni-directional Range) station. The radial direction is indicated on the HSI with a specific bearing that aligns with the aircraft's current heading.

The correct indicator for this clearance would show the aircraft's heading pointing towards the selected radial in a manner that demonstrates an intercept course. When instructed to intercept a radial to the southwest of the station, the proper HSI would display the aircraft on a trajectory that aligns with the southwest radial, typically showing the needle centered when directly on the radial.

In this context, the specific HSI that reflects this would be the one that shows the aircraft appropriately situated to intercept that southwest radial—indicating that the aircraft is on course to reach the designated navigation path effectively.

Therefore, the selected answer representing this situation is the one that successfully visualizes compliance with the ATC's clearance to intercept the designated radial southwest of the station.