Answer:
B. adult; elastic.
Explanation: As wage increases, the adult worker will want to give more labor, which means the supply of labor will be increased and the demand will reduce.Wage increase is proportional to the increase in the supply of labor, most workers or laborers will want to give more or supply more labor and the employers will try to reduce their demand for labor. Elasticity of Labor supply is assumed to be greater than 1 as wage increases.