Spot the borrowed chord

Listen to a progression in major and identify the chord that comes from outside the key.

1. Step 1Listen to the progression in C major: nearly all the chords are diatonic.
2. Step 2One chord is borrowed (modal mixture: iv, ♭III, ♭VI or ♭VII) and sounds darker or unexpected.
3. Step 3Pick the chord that does not belong to the key and confirm.