Answer:
The most common theory and all other theories about Nessie are likely not true.
Step-by-step explanation:
In the passage, the writer explains that many people are unsure of what they see when they visit Loch Ness. They arrive at conclusions based on their imaginations or what others have assumed to see.
The best solution to solve the riddle of monster theories according to the author is Sonar technology which is a scientific approach. This scientific approach would disprove the theories about Nessie.