For a carboxypeptidase with a Michaelis constant (Km) of 2.00μM and a turnover number (kcat) of 150s⁻¹ for its substrate A, what is the enzyme's catalytic efficiency (kcat/Km)?

a) 75,000 M⁻¹s⁻¹
b) 74,000 M⁻¹s⁻¹
c) 73,000 M⁻¹s⁻¹
d) 72,000 M⁻¹s⁻¹