Which of the following is an incorrect statement?

• A

  GM crops are more tolerant to abiotic stresses such as heat, cold, salinity and drought

• B

  By using herbicide-resistant GM crops, weeds can be eliminated from the field without the use of manual labour

• C

  RNAi has been used to make tobacco plant resistant to Bacillus thuringiensis

• D

  A nematode Meloidogyne incognitia infects the roots of tobacco plants and causes a great reduction in yield