Consider 10 data such that their mean is 10 and variance is 2. If one of the data $\alpha$ is removed and new data entry $\beta$ is inserted. Now new mean is 10.1 and new variance is 1.99 then $( \alpha + \beta )$ is equal to\\
(A) $10 \bar { x } _ { \text {new } }$\\
(B) $20 \quad \sigma _ { \text {new } } ^ { 2 }$\\
(C) 1\\
(D) 2