A.I. Explanation:

Option 1: "It is not a new way to fight cancer."

Explanation: The text clearly states that Leonard Seymour is preparing to launch trials of a 'radical new way to fight cancer,' indicating that this method is indeed new. Therefore, this option contradicts the information presented in the text.

Option 2: "The virus will be delivered by blood."

Explanation: The text mentions that Prof Seymour's solution involves delivering viruses to tumors 'via the bloodstream,' which directly supports this option. This aligns with the main idea of the text, which focuses on the innovative method of using viruses to target tumors.

Option 3: "The experiment of this method has succeed."

Explanation: The text indicates that 'several more years of trials will be needed,' suggesting that the method has not yet succeeded in experiments. This option presents information that is not supported by the text.

Option 4: "This method can be applied to all cancers."

Explanation: While the text expresses hope that this method 'might be applied to all cancers' in the future, it does not state that it currently can be applied to all cancers. This makes the option misleading and not true based on the current context.