Wires of two dissimilar metals, A and B, develop an open-circuit voltage of 45 $$muV$$ per °C of temperature difference above a reference temperature. A thermopile consists of 50 thermocouples connected in series as shown in the figure. The reference junctions are maintained at 60°C, and $$V_(ab)$$, is measured to be 60 mV. The temperature (°C) of the bot junctions is most nearly:
A. 27
B. 87
C. 1,330
D. 1,390