Limiting compositions of f-block hydrides are

• A. \[M{{H}_{2}}\] and \[M{{H}_{3}}\]
• B. \[M{{H}_{3}}\] and \[M{{H}_{5}}\]
• C. \[M{{H}_{2}}\] and \[M{{H}_{8}}\]
• D. \[M{{H}_{2}}\] and \[M{{H}_{6}}\]