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Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options (a), (b), (c), (d) given at the end of each question.
\( \begin{array}{lll} & \text { Column I } & \text { Column I } \\ \text { (A) Used as a source of } \mathrm{O}_{2} \text { in submarines, } & \text { (p) } & \mathrm{Mg}\left(\mathrm{ClO}_{4}\right) \\ & \text { space shuttles and oxygen masks } & \\ \text { (B) Used in obtaining the X-ray of the stomach } & (q) & \mathrm{CaH}_{2} \\ \text { (C) Used as a drying agent } & (r) & \mathrm{KO}_{2} \\ \text { (D) Reacts with water to produce } \mathrm{H}_{2} & \text { (s) } & \mathrm{BaSO}_{4}\end{array} \)
(A) A-r, B-p, C- \( q \), , D-s
(B) A-r, B-s, C-p, D- \( q \)
(C) A-s, B- \( q \), C- \( -r \), D-p
(D) A-p, B-r, C-s, D- \( q \)
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