Table $34-1$

$\backslash$table$[[$Country A$,$Country B$,,],[$Good X$,$Good Y$,$Good X$,$Good Y$],[90,0,30,0],[60,30,20,20],[30,60,10,40],[0,90,0,60]]$

Refer to Table $34-1.$ Considering the data, which of the following terms of trade would both countries agree to$?$

a$.1$ unit of $Y$ for $1\mathrm{.}50$ units of $x$

b$.1$ unit of $Y$ for $1$ unit of $x$

c$.1$ unit of Y for $0\mathrm{.}25$ units of X

d$.1$ unit of $Y$ for $0\mathrm{.}75$ units of $x$