Why Is Providing TAM,SAM,and SOM for a Product or Service

Multiple Choice

Why is providing TAM,SAM,and SOM for a product or service unlikely to fully satisfy potential investors?

A) Even when well researched,they tend to be unreliable.
B) They tend to focus too much on competition.
C) They don't provide information about where the market is going in the future.
D) They tend to be overly optimistic,especially about the customers your marketing is likely to reach.