GMAT Critical Reasoning (CR) | Re: Which of the flowing most logically completes the argument?

Which of the flowing most logically completes the argument?

The attribution of the choral work Lacrimae to the composer Pescard (1400 – 1474) has been regarded as tentative, since it was based on a single treatise from the early 1500’s that named Pescard as the composer. Recently, several musical treatises from the late 1500’s have come to light, all of which name Pescard as the composer of Lacrimae. Unfortunately, these newly discovered treatises lend no support to the attribution of Lacrimae