A foreign$-$based supplier is being rated every year $($using the weights and scores method$)$ in terms of the following three competitive advantages standards:

$$

Weight

Year $1$

Year $2$

Year $3$

Quality

$5$

$90$

$80$

$75$

Delivery speed

$3$

$70$

$85$

$70$

Cost

$2$

$70$

$80$

$95$

$$

$$

$$

$$

$$

Final weighted score

$$

x

y

z

To make a decision to continue with this supplier, it can be said that it $\_\_\_\_\_($select the best answer by determining x$,$ y$,$ and z above$).$

A$.$

has a weighted score of $77\mathrm{.}5,80$ and $81\mathrm{.}5$ in Years $1,2,$ and $3$ respectively

B$.$

should be evaluated with more weight on cost

C$.$

has not much changed from year to year

D$.$

had its best year in Year $2$