What is the beta of the following portfolio?

$\backslash$table$[[$Stock$,$Amount Invested,Security Beta$],[$A$,$$$2,000,1\mathrm{.}30],[$B$,$$$2,700,1\mathrm{.}61],[$C$,$$$5,000,0\mathrm{.}72]]$

Multiple Choice

$1\mathrm{.}007$

$1\mathrm{.}067$

$0\mathrm{.}345$

$1\mathrm{.}123$

$1\mathrm{.}087$