Respuesta :

[tex]\begin{gathered} 778\cdot23=17,894 \\ 700\cdot30=21,000 \\ 700\cdot20=14,000 \\ 800\cdot20=16,000 \\ 800\cdot30=24,000 \end{gathered}[/tex]

800 x 20 = 16,000 is closest to 17,894

Therefore, the best estimate is Option C, 800 x 20

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