Hello from MrBillDoesMath!
Answer:
The graph in the lower left-hand corner (row 2, column 1)
Discussion:
The ⌊x⌋ function, sometimes called the "floor" function, gives the largest integer less than or equal to x . The floor function is shown in row 1, column 1. But the question asks us to plot the negative of the floor function which essentially "flips" the floor function around the x axis.
Thank you,
MrB