What is the function of the figures “12,000”(people), “500”(positions), and 12,000 (customers) cited in para.3?
A. To support the idea that SolarCity can be more economically influential.
B. To show that SolarCity is the market leader in the field of solar panels.
C. To prove that SolarCity is very successful in expanding its business.
D. To indicate that SolarCity is a big international company.
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