What Do Most Labour Economists Believe About the Supply of Labour

What do most labour economists believe about the supply of labour

A) It is less elastic than demand and therefore firms bear most of the burden of the payroll tax.
B) It is less elastic than demand and therefore workers bear most of the burden of the payroll tax.
C) It is more elastic than demand and therefore workers bear most of the burden of the payroll tax.
D) It is more elastic than demand and therefore firms bear most of the burden of the payroll tax.