Express the options in scientific notation.
Option A.
[tex]0.000785=7.85\times10^{-4}[/tex]Option B:
[tex]0.0005623=5.623\times10^{-4}[/tex]Option C:
[tex]0.00091=9.1\times10^{-4}[/tex]Option D:
[tex]0.00587=5.87\times10^{-3}[/tex]Thus, option A, B and C can be expressed as number times 10^-4.