What is the primary objective of producing/using herbicide-resistant $GM$ crops?

An organisation aiming to regulate biotechnological activities was established by the Indian Government named

Bacillus thuringiensis forms protein crystals which contain a toxic insecticidal protein. This protein:

The $Cry$ gene,which produces crystal proteins,is isolated from:

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?

The anticoagulant hirudin is obtained from