The older violins no longer had original parts, but each violinist played instrument well. which pair of pronouns correctly completes the sentence? their; his or her its; his or her its; their their; their

The older violins are more than one object, in this case its cannot be used, only their; each violinist could mean male or female, so it would be possible the use of his or her or their (applied for either),but there is only the latter option. The correct answer is their/their.

The older violins no longer had their original parts, but each violinist played their instrument well.

i've read it so how can i ?