How is Cumulonimbus Mammatus located to the west of the observation location and moving east encoded in column 14?

The correct encoding for a Cumulonimbus Mammatus cloud formation located to the west of the observation point and moving east is represented as "CBMAM W MOV E." This encoding succinctly conveys all critical information about the cloud's type, its location relative to the observer, and its movement.

The abbreviation "CBMAM" specifies the type of cloud, which is Cumulonimbus Mammatus. The direction "W" indicates that the cloud is situated to the west of the observer. The term "MOV" signifies the movement of the cloud, and "E" denotes that it is moving towards the east. Thus, all essential elements – the type of cloud, its location, and its movement – are included in a structured and informative format.

Other options provided may lack certain aspects of this information, such as omitting the "MOV" term or misrepresenting the directionality or type of cloud. Therefore, option A is the most comprehensive and precise way to encode the conditions described in the question.