The correct option is C - 70 mv
The value of the resting membrane potential varies from cell to cell and ranges from about −20 mV to −100 mV. For example, in a typical neuron, its value is −70 mV, in a typical skeletal muscle cell, its value is −90 mV, and in a typical epithelial cell, its value is closer to −50 mV. So, the correct answer is option C.