The Heckscher $-$ Ohlin, factor $-$ proportions model lends support to the argument that

A$.$ trade tends to worsen the conditions of highly skilled workers in rich countries.

B$.$ trade tends to worsen the conditions of owners of capital in rich countries.

C$.$ trade tends to worsen the conditions of unskilled labor in rich countries.

D$.$ trade tends to worsen the conditions of workers in poor countries.

E$.$ trade tends to worsen the conditions of workers in rich countries.