16) in this passage dr. king cautions his audience against using violence by telling them to a) stand on the warm threshold leading to the palace of justice. b) distrust all white people except those participating in the march. c) conduct their struggle on the high plane of dignity and discipline. d) shake the foundations of their nation until the bright day of justice emerges.

Since the passage is not included with the question. We can understand that a request against using violence cannot include some offensive action words, such as "distrust"; "stand"; "shake", which were used in the sentences A, B and D.  But the meaning of his request is clearly perceived in the sentence C, that, despite of being a strugle, it should be conducted on what he considered a high plane of dignity and discipline.

Answer C.

The Answer is C! "...conduct their struggle on the high plane of dignity and discipline."

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,