S1:There is a crossing traffic on our starboard beam,I'm altering the course to starboard side to cross her bow. S2:What will happen if she alters course to starboard? I'm afraid we will take a risk of collision. Q:What advice does the second speaker give? A. Turn to portside. B. Cross another vessel's bow. C. Change course to 30 degrees. D. Change the rudder at once.