(A) Agrobacterium tumefaciens is a soil bacterium that naturally infects plants. It contains a large plasmid called the Tumor-inducing $(Ti)$ plasmid.

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(A) Agrobacterium tumefaciens is a soil bacterium that naturally infects plants. It contains a large plasmid called the Tumor-inducing $(Ti)$ plasmid. This plasmid carries the $T-DNA$ (Transfer $DNA$),which is integrated into the plant genome,causing the formation of crown gall tumors. Therefore,the correct option is $A$.