One of the differences between Lyme disease and Rocky Mountain spotted fever (RMSF) is that:
A. Lyme disease is transmitted by mosquitoes and RSMF by ticks.
B. Lyme disease is caused by a bacterium and RSMF by a rickettsial agent.
C. Lyme disease is caused by a rickettsial agent and RSMF by a bacterium.
D. Lyme disease is transmitted by ticks and RSMF by fleas.
E. None of the above.