Answer: Option B
Explanation: Studying the external factors that influence the operations of the organization is called external environment analysis.
A. Scanning in external activity refers to identifying the threats and opportunities in the environment.
C. Monitoring refers to keeping track of external factors that can affect operations.
D. Assessing involves analyzing the current trends in various kinds of relevant factors such as political, economical etc.
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Decrypting in simple words means decoding a data that has been saved in a code language. This is not a part of external environment analysis.