Which of the following is very expensive?

In $BT$ cotton, what does $BT$ stand for?

Which part of the tobacco plant is infected by $Meloidogyne \ incognita$?

The toxic component of $Bacillus$ $thuringiensis$ is:

What is the short form for Genetically Modified Organisms?

Main objective of production/use of herbicide resistant $GM$ crops is to
$(A)$ -Reduce herbicide accumulation in food articles for health safety.
$(B)$ -Eliminate weeds in the field without the use of herbicides.
$(C)$ -Eliminate weeds from the field without the use of manual labour.
$(D)$ -Soil pollution and biomagnification caused by herbicides.
Which of the following statements are correct?