After birth, a baby's weight increased at a steady rate for several weeks. A linear model of the situation contains the values (1, 7) and (10, 8.8), where X represents the number of weeks, and Y represents the baby's weight, in pounds. What was the baby's weight at birth? A. 0.2 of a pound - B. 7 pounds - C. 6.8 pounds - D. 9 pounds