Need help with nothing

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

Because its reliable.   there is no pollution  the chances of a radiation leak is low

Ithink it is letter b, i may be wrong but i think that is the answer