Answer: 
 
Option B. 3/4 > 2/3 is the correct answer. 
 
Step-by-step explanation: 
 
Lets look at the options one by one 
 
A. 1/2 < 1/3 
 
This inequality converts into 0.5<0.33 which is false. 
 
B. 3/4 > 2/3 
 
This simplifies to 0.75>0.666 which is true. 
 
C. -1/4 < - 2/3 
 
This converts to -0.25<-0.666 which makes the inequality false. 
 
D. -1 > 3/4 
 
This converts to -1>0.75 which makes the inequality false. 
 
Hence, 
 
Option B. 3/4 > 2/3 is the correct answer.