It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their diseasecarrying capacity. In this way the dangerous wild population could eventually be replaced by a harmless one without leaving room for another disease-transmitting strain to flourish. One candidate gene would interfere with the mosquitoes' finding mates; another would cause the destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mechanism of the mosquito' s own resistance to disease, so that it would die before transmitting the disease. Which one of the following identifies a discrepancy in the proposal above? ['Two of the proposed ways of destroying disease-carrying capacity in the wild mosquito population would jeopardize the goal of the proposal.', 'Evidence is not presented to show that each alternative method has been successfully tested on a limited scale.', 'None of the three proposed alternatives would assure that there would be fewer mosquitoes in any given area.', 'It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.']