Let $\bar{X}$ and $M.D.$ be the mean and the mean deviation about $\bar{X}$ of $n$ observations $x_i,$ $i = 1, 2, \dots, n.$ If each of the observations is increased by $5,$ then the new mean and the mean deviation about the new mean,respectively,are
- A$\bar{X}, M.D.$
- B$\bar{X} + 5, M.D.$
- C$\bar{X}, M.D. + 5$
- D$\bar{X} + 5, M.D. + 5$
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