Which of the following is not a coordinating conjunction?

and
but
still
for

The correct answer is:  [C]:  " still " .

Note: A popular "mnemonic device" for remembering the

     "7 (seven) coordinating conjunctions" is:  " FANBOYS " ;

in which each of the 7 (seven) letters stand for 1 (one) of the 7 (seven)

coordinating conjunctions; as follows:

F = for  ;

A = and   ;

N = nor   ;

B = but   ;

O = or   ;

Y = yet   ;

S = so  .

We are given the answer choices:  

      →  " and ;  but  ; still ; for ."

Among these 4 (four) answer choices:

 "and" ; "but", and "for" ; are "coordinating conjunctions."

We are asked which answer choice is "Not" a "coordinating conjunction."

  The remaining answer choice:  [C]:  "still" ; the third answer choice;

is "Not" a "coordinating conjunction" ; and as such , the correct answer.

Note that the "S" in "FANBOYS" ; stands for:  "so" — Not:  "still" .

This is a potential limitation of using this mnemonic; however, by practice of memorizing and familiarizing oneself with the "actual words" associated with this mnemonic, the mnemonic device:  "FANBOYS" can still be helpful.

Hope this answer is helpful to you!

    Best wishes!

are you kidding? from that description of two mansions, you can't figure out which one is bleak and desolate? maybe you should consider looking those words up in a dictionary, if you don't know what they mean already.