Final answer:
The unit rate of the equation y = 1/2 x is 1/2, making the correct answer B) 1/2.
Step-by-step explanation:
The equation given is y = 1/2 x. To find the unit rate of this equation, you look at how much y changes for every 1 unit increase in x. In this equation, for every increase of 1 in x, y increases by 1/2. Therefore, the unit rate is 1/2, which means the correct answer is B) 1/2.