Which of the Following Is True of Organic Farming as Certified

Which of the following is true of organic farming as certified in the Europe,the USA and many other countries?

A) Organic farmers are allowed to use only organic chemicals (those containing carbon) .
B) Improvement of soil quality is an official goal of organic farming.
C) The burning of all plant residues is encouraged in organic farming.
D) Organic farms can use only animal manure to supply nutrients and build soil organic matter.
E) Organic farmers can use only compost made form plant materials to supply nutrients and build soil organic matter.