Along the Supply Curve of Lifeguards at Local Public Pools

Along the supply curve of lifeguards at local public pools,

A) the wage paid to lifeguards is held constant
B) the number of lifeguards is held constant
C) the wage paid to lifeguards at private clubs is held constant
D) the demand for lifeguards is assumed constant
E) the admission price to these public pools rises as the wage rate for lifeguards increases