Answer :
first you can cross out A and D because those are the obvious wrong answers. the answer would be B because the vertical intercept is the y-intercept and 4 was added to the slope. if a number is added to the slope that number will be the vertical intercept.
The verticall intercept is the value of H
when t=0.
It's 4 in this equation.
It's that "several inches" of water that were in the bucket when the rain was ready to start.