Read the following sentences: “If the biochar was going to cost a small fortune, it would not be feasible for local government or nonprofit groups to use in such large amounts. The team went back to the drawing board. They redesigned the biochar tests by increasing the biochar in specific locations.” What does it mean to “go back to the drawing board” in this context?
continue with the same experiment
change the current experiment
design a new experiment
give up on the experiment altogether

It means that you and what it is you were doing is wrong so to go back and try again

Explanation:

Like if you have a project about fish and you say they can live outside of water your teacher might say go back to the drawing board and try again

yes it is like you know me bro

given the fact that the question is about the detail that best support the idea that oppressive leaders use   propaganda to achieve thir goals,   the first option does not refer to any kind of propaganda, since it only tells about that the milk and the windfall apple should be reserved for the pigs. in the second option, that is, "snowball and napoleon sent out flights of pigeons whose instructions were to mingle with the animals on the neighbouring farms, tell them the story of the rebellion, and teach them the tune of "beasts of england". it can be identified that the oppressors make use of the propaganda, which is represented by the pigeons, and the information they have to tell other animals about what was happening in the farm in order to get their objectives. for that reason, the right answer is the second option, taking into account that the third option do not refer to propaganda since it only talks about that they did not want jones back. and, finally, the last option refers to the result of the given news, but it does not mean about the propaganda they used to achieve their goals.