Tumour inducing plasmid used in producing transgenic plants is that of

The correct option is D $Agrobacteriumtumefaciens$
Transgenic plants
Plants containing one or more genes from another species are called transgenic plants. They have been created by genetic engineering processes.

Ti plasmid
The Ti plasmid or tumour inducing plasmid (extrachromosomal DNA) is carried by $Agrobacteriumtumefaciens$ . The T-DNA segment of the Ti plasmid integrates itself into the plant cell’s genome to induce tumour formation in plants. This property of the plasmid makes it an effective vector for transferring foreign genes into plant cells.

$Escherichiacoli$
$Escherichiacoli$ is a gram negative bacteria. It is a preferred common host for gene cloning experiments.

$Bacillusthuringiensis$
$Bacillusthuringiensis$ produces a particular endotoxin (cry protein) which binds to specific receptors on the membranes of midgut (epithelial) cells of the targeted pests, resulting in the leakage of contents and death of the insect. Therefore this bacterium is used as a biopesticide.

$Staphylococcusaureus$
$Staphylococcusaureus$ is a gram positive bacterium. It causes skin and soft tissue infections such as boils and cellulitis.

Final answer:
c. $Agrobacteriumtumefaciens$