单选题A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.Awill be coming to periscope depthBwill be coming to the surfaceCis on the bottom in distressDis in distress and will try to surface
单选题
A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A
will be coming to periscope depth
B
will be coming to the surface
C
is on the bottom in distress
D
is in distress and will try to surface
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