30. When wild-type Agrobacterium tumefaciens infects a plant, it causes crown gall disease. After its T-DNA is transferred into the plant genome, which genes are expressed to cause tumor formation?
(A) Genes synthesizing cellulose and lignin.
(B) Genes synthesizing defensins and salicylic acid.
(C) Genes synthesizing auxin, cytokinin, and opines.
(D) Genes synthesizing abscisic acid (ABA) and ethylene.

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