How is B descriptively accurate and A isnt?

if an AC has "not", and stimulus doesnt, does it matter?

took me 3x more time but finally got it correct

i still dont get it, please explain #help

I just cannot understand how A is wrong, it says exactly what sub conclusion says

im so confused. if we take the contropositive of the conclusion, isnt it what the first sentence says?

same

because politicians can be honest but they wont be effective politicians.

same ugghhh

I am confused why B is wrong because it says most research funded by the government gives rise to ethical dilemmas. The first sentence in the Q stem says "almost all research gives rise to ethical dilemmas". Since most of it is funded by the gov and almost all gives rise ton ethical dilemma so wont most of research funded by gov would give rise to ethical dilemma

THANK YOUUUU!!!!!

at 2:13, "only" is used, since "only" is in group 2 so anything that comes right after it, isnt that necessary condition?

and from that logic, shouldnt the lawgic be fv->stress

I am confused why A is wrong. Only is group 2 indicator and any sentence after only is necessary condition. so mainstream location is necessary and rent less than 10 is sufficient so it is not reverse, can someone please explain?