Hi again
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1. "Farmers" is the right word to use:
"Farmers of maize, beans, and tobacco, the wendat, Native american tribes that inhabited(B) present-day Michigan, lived a sedentary life(C) in densely populated(D) villages."
"Farmers" refers to the wendat, the people. The wendat were farmers, they grew maize and beans in farms. I'll rewrite the sentence in a different way, it might help you see what I mean:
"The wendat, Native American tribes that inhabited present-day Michigan and were farmers of maize, beans, and tobacco, lived a sedentary life in densely populated villages."
2. "Varieties" is the right word to use, instead of "variety". The sentence states that there are more than 2,000 so the plural is necessary. You say "one variety", but "many varieties".
"Basic" is ok, it is an adjective modifying "mixture": a basic mixture.
3. Sentence A is correct:
"Two pieces of bread are taken to the kitchen."
You have a plural subject *two pieces of bread) so you need the "plural" form of "to be": "are".
If the sentence had been abut only one piece of bread, it would have been:
"One piece of bread is taken to the kitchen."
Miriam