Which Ion(s) Have a Net Chemical Force Acting to Move

Multiple Choice

Which ion(s) have a net chemical force acting to move the ion(s) into the cell? (Assume a resting membrane potential (V_m) of -70mV.)

A) X⁺, whose [ECF] is 120 mM and [ICF] is 30 mM
B) A ^-, whose [ECF] is 100 mM and [ICF] is 100 mM
C) B ^-, whose [ECF] is 140 mM and [ICF] is 30 mM
D) both X⁺ and B ^-ions
E) X⁺, A ^-, and B ^-ions