Q66648 - FGV - 2010 - CODESP-SP - Advogado - Tipo 1,

From the passage as a whole we infer that

a) tug vessels remain the same.
b) the tugboat history has not evolved much.
c) the shipping industry is facing hard times.
d) the shipping industry is shrinking.
e) a tug captain must be an exceptional seaman.