Im having trouble interpreting "no mark of that group's success"

Isn't it supposed to mean that "it does not show whether the group is successful or not" ?

How can it be understood as being unsuccessful?

#help (Added by Admin)

But does being attracted to humans by body heat necessarily prohibits the possibility that mosquitoes can be attracted by some other substances as well at the same time?

Even after watching the explanation video I still think that mosquitoes being attracted to humans by body heat does not necessarily exclude the possibility that some other gaseous substance given off by human skin also attracts mosquitoes. Negating (B) doesn't wreck the argument.(Or does it?) In my opinion, it just weakens by adding another plausible hypothesis so I think (B) is merely strengthening and not really necessary.. Help meeeee....

#help

I got this question right and it is such a minor thing so I am wondering if i am thinking too complexly more than what is needed..

But isn't it that the condition actually needs, "If the photographs that the store developed were quite unsatisfactory" to be necessary? I mean the condition in (b) is sufficient enough to trigger and get us our conclusion, but this condition does not have to be applied in situations where the photographs were satisfactory or in some other kinds of random situations where the developed photographs are not quite unsatisfactory. Or does it?

Heyyy I have hard time going through the RC and I feel for you. I think everyone has their own section that distresses them.

I know it could be hard and sometimes you might question yourself if you will be able to make it work, but you can do this!!

It can be frustrating watching others scoring higher with seemingly less time you put into or when you expect higher scores yet get the same scores all the time, but it is all being accumulated even if you can't see the instant result.

Treat yourself with a nice meal tomorrow and pull yourself together!!

I wish you best luck :)