Confused about Nernst equation -Intro to Physiology Help please  ?

Solutions A and B are separated by a membrane that is permeable to Ca2+ and impermeable to Cl−. Solution A contains 10 mM CaCl , and solution B

contains 1 mM CaCl2. 

Assuming that 2.3 RT/F = 60 mV, Ca2+ will be at electrochemical equilibrium when

(A) solution A is +60 mV

(B) solution A is +30 mV

(C) solution A is −60 mV

(D) solution A is −30 mV

(E) solution A is +120 mV

(F) solution A is −120 mV

(G) the Ca2+ concentrations of the two solutions are equal 

(H) the concentrations of the two solutions are equal

Now I know that solution A will have a negative potential difference and I would've assumed the answer was D but I'm confused about the 60mV they provided in the question. 

The equilibrium potential is the membrane potential at a specific concentration gradient when a specific ion is at equilibrium, correct ? An ion being at equilibrium just means that there is no net diffusion of the ion. 

If I use 60log(10/1) I'll get 60 mV 

What is this 60mV ? Is it the equilibrium potential of Ca2+ ions ? If yes why isn't the answer C ?