The missing reagents \[{{R}_{1}}\] and \[{{R}_{2}}\] in the following series of reactions are \[C{{H}_{3}}C{{H}_{2}}Br\xrightarrow{{{R}_{1}}}[\,\,\,\,]\xrightarrow{{{R}_{2}}}C{{H}_{3}}\overset{-}{\mathop{C}}\,H{{P}^{+}}P{{h}_{3}}\]

• A. PhLi and \[P{{h}_{3}}P\] respectively
• B. \[P{{h}_{3}}P\] and PhLi respectively
• C. \[P{{h}_{3}}P\] and \[{{C}_{2}}{{H}_{5}}ONa\] respectively
• D. Either [b] or [c]