Answer:
D
Step-by-step explanation:
Over the first three examples on the top, the grid of dots gets one dot longer and one dot wider each time. We can assume from this that the pattern will continue and that we will get one dot longer on the top (so 5 dots, as depicted in D) and one dot longer on the side, (so 4 dots, as depicted in D)
By adding one dot to both the length and width of the grid and continuing the pattern, we can assume it will be D.