People at a family reunion recorded in a stem-and-leaf plot the year they were born. The stem ranges from 194 to 200.
First row of leaves: 0
Second row of leaves: Empty
Third row of leaves: 5, 9
Fourth row of leaves: 0, 7, 7
Fifth row of leaves: 2, 3, 8
Sixth row of leaves: 4, 6, 7, 9
Seventh row of leaves: 1, 1, 1, 3, 5
Key: 198 | 5 = 1985
How many people in the group were born before 1970?
a. 3
b. 4
c. 5
d. 6