The correct answer is: Only assumption I is implicit.
The statement “Please consult us before making any decision on investment” implies that the speaker believes that the listener may make a wrong decision if they do not consult them. This is because the speaker is asking the listener to consult them before making a decision, which suggests that they believe that the listener may not be able to make a good decision on their own. However, the statement does not imply that it is important to take a right decision. It is possible that the speaker is simply trying to be helpful and does not have any particular opinion on whether or not it is important
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