conparison

[tokyo-cowboy]

He plays the pianno better ( A ) but sings much worse ( B ).

if you put " than I do" in the blank, which one seems more appropriate?
My guess is (A) is the more likely but it's based on just my ( as a non English native ) feeling. i would like to know how this is received by English native speakers.

[J&K Tutoring]

The comparison is much more clear in the A position.

The word piano has only one 'n'.