Please help

Rarinstraw, MathEevee, Shane and guest  are correct......

The slope of the line = 5/2  =  gallons / minute  = 2.5

Answer  C

I would say D is the safest bet.

Per every 2 minutes, 5 gallons of water are dispensed, 5/2=2.5, so c

I apologize if my opinon is wrong but, in my mind best answer would be letter C.

Explanation-

Since in this problem there is time and amount. If I recall correctly this is called proportonality. The question is asking for you to find the rate, as in ratio. To find the answer, you must set up a ratio. I would set it up with the greatest number on the chart. Set it up by amount then time- 25:10. or 25/10. Then just, divide for the answer. 

I think its C

definetly c becaues at the point (2,5), it can be simplified down to 2.5 as the unit rate

Thanks guys!!!