Which graph represents g(x)=−(x+3)^2−5 ?

The answer is the graph in the top right. It is shown at: https://www.desmos.com/calculator/6bgozkscuh

(-1) (x+-3)^2 - 5    

The -1 flips the parabola upside down (so it looks like a dome)

The +3  shifts the graph 3 units to the LEFT

The -5 shifts the graph DOWN 5 units