Serpentine soil is dry and low in nutrients and usually contains heavy metals such as nickel, chromium, etc. that are toxic to most species. Researchers have found that a population of Arabidopsis plants grow in serpentine soil, which affects them It is a very extreme environment. Some researchers have analyzed the genes of this Arabidopsis plant and thought that they "borrowed" some favorable genes from the nearby relatives to help them cope with the extreme environment. However, some opponents believe that this Arabidopsis plant adapts to the environment by obtaining genetic mutations by means of original genetic mutations. Which of the following, if true, would most weaken the opponent's point of view? ['Other plants growing in serpentine soil are completely independent and adaptively evolved through natural selection.', 'The Arabidopsis plant that has not been seen growing in non-serpentine rocky soil has been genetically modified to adapt to the environment.', 'A characteristic gene fragment of a nearby relative was detected in the Arabidopsis plant growing in serpentine soil, the gene fragment enhances tolerance to heavy metals.', 'No genetic modification found in plants growing in nearby non-serpentine soil.']