Would it make sense to add more points to the graph from x=0 to x =0?

Arational number that is equivalent to -20/4?

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels

Which answer choice is it? is it the first ,second, third or fourth giving 40 points for whoever answers correctly you