The correct option is B The Mesopotamians referred to the Indus Valley as "Meluha".
There are two bits of evidence that confirm interactions between the Indus Valley civilisation and the Mesopotamian civilisation. The first pertains to the presence of each other's seals in the other's excavation sites. This was confirmation of the trade between the two civilisations. The second involves the scripts of Mesopotamia wherein they make references to the Harappans. In these particular scripts, the Indus Valley was referred to as "Meluha", something that The Immortals of Meluha has directly or indirectly drawn upon.