The correct answer is: C. Either I or II is implicit
The statement “Double your money in five months” is an advertisement. Advertisements are designed to persuade people to buy something. In this case, the advertiser is trying to persuade people to invest in their product. In order to be persuaded, people need to believe that the product will do what the advertiser says it will do. In other words, people need to believe that the assurance is genuine.
However, people are also aware that not all advertisements are truthful. They know that some advertisers make false claims in order to sell their products. Therefore, people may also assume that the assurance is not genuine.
The statement does not provide any information about whether the assurance is genuine or not. Therefore, either assumption I or assumption II could be implicit in the statement.