单选题In observing rig motion while under tow，the period of roll is the time difference between（）.Azero inclination to full inclination on one sideBfull inclination on one side to full inclination on the other sideCfull inclination on one side to the next full inclination on the same sideDzero inclination to the next zero inclination
单选题
In observing rig motion while under tow，the period of roll is the time difference between（）.
A
zero inclination to full inclination on one side
B
full inclination on one side to full inclination on the other side
C
full inclination on one side to the next full inclination on the same side
D
zero inclination to the next zero inclination
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