Correct answer: B — Media effect

Lagged or past interest rates are useful in modeling the media effect, which captures how homeowners respond to recent interest-rate movements and refinancing headlines. Past rates can proxy for borrower awareness of refinancing opportunities.

As noted in the source, lagged rates help model:

• the change in rates over the past month, and
• the level of rates relative to recent lows.

These are path-dependent effects, not path-independent values.