Which of the following cases provides the highest diversification benefits?

a$.$ Two securities with correlation less than one

b$.$ Two uncorrelated securities

c$.$ Two securities with correlation $-0\mathrm{.}75$

d$.$ Two securities with correlation equal to $1$

e$.$ Two securities with correlation $0\mathrm{.}75$

f$.$ Two securities with correlation $0\mathrm{.}5$

g$.$ Two securities with correlation $-0\mathrm{.}5$

ear my choice