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If $$1 \lt r \lt s \lt t \lt 2$$, then, of the following, which is closest to $$r+(s\times10^{6})+(t\times10^{12})$$?
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A.$$(r+s+t)\times10^{6}$$
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B.$$3s\times10^{9}$$
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C.$$t\times10^{12}$$
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D.$$(r+s+t)\times10^{12}$$
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E.$$(r+s+t)\times10^{18}$$
C显示答案
