B - The environment within the cell is stable.
Homeostasis is when your body works to maintain equilibrium (balance) so within a cell, the cell would be stable
To find an average, add all the terms together and then divide them by the number of terms.
7.1 + 9.8 + 2.3 +8.5 + 7.4 + 5.7 = 40.8
40.8/6 = 6.8.
so yes, the answer is b.