The cello.
The cello is the largest of the three instruments.
The 'cello is the larger of these instruments.
viola
The 'cello is larger than the viola, which is larger than the violin.
1st violin 2nd violin Viola Cello
Typically a string quartet is two violins, one viola, one cello.
The viola is both larger than the violin and smaller than the cello.
violin, viola cello, bass
an oboe.
The Cello, whose standard size is about 47 in (119cm) including the neck is the largest.
A viola is a string instrument of the violin family. It is larger than a violin but smaller than a cello, and like the violin and cello it is played with a bow.
ViolinViolaCelloBass