Excellent! As you can see from the figure itself, at $$t = 4$$ s, the slope is the largest. At $$t = 1$$ s, the slope is the flattest. As time increases, it grows steeper and steeper.
$$t = 1 \, \mathrm{s}$$
$$t = 2 \, \mathrm{s}$$
$$t = 3 \, \mathrm{s}$$
$$t = 4 \, \mathrm{s}$$