4. Given that variables x and y satisfy the relationship $y = - 0.1 x + 1$, and variable y is positively correlated with z, the correct conclusion is
A. x and y are positively correlated, x and z are negatively correlated\\
B. x and y are positively correlated, x and z are positively correlated\\
C. x and y are negatively correlated, x and z are negatively correlated\\
D. x and y are negatively correlated, x and z are positively correlated