following functions represents the world's population P, in billions of people, t years since 1975? (1 billion = 1,000,000,000) \text { A. } P(t)=4(1019)^{t} \text { B. } \quad P(t)=4(19)^{t} \text { c } \quad P(t)=119 t+4 \text { D. } P(t)=1019 t+4
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