Use the stem-and-leaf plot below to answer questions 1–3.
stem-and-leaf plot
The stem-and-leaf plot consists of five rows of numbers. A single vertical line separates the first and second columns. The stem in row 1 is 5; the leaves in row 1 are 4 and 5. The stem in row 2 is 6; the leaves in row 2 are 0, 6, and 9. The stem in row 3 is 7; the leaves in row 3 are 2, 3, 4, 5, and 5. The stem in row 4 is 8; the leaves in row 4 are 1, 2, 8, and 9. The stem in row 5 is 9; the leaves in row 5 are 5 and 6.
A key in the corner reads 5 line 4 equals 54.
What is the mode of the data?
A. 5
B. 70
C. 75
D. 88