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ANSWER: C. Lithium, Hydrogen, Silicon
Periodic trends such as ionization energy, electronegativity, atomic radii, basicity e.t.c. are VERY important to know as they are commonly tested topics. It is also important to recognize the groups in the periodic table such as the Metals, Non-metals and Metalloids. Only choice (C) provides an element from each group. Lithium (Metal), Hydrogen (Non-metal) and Silicon (Metalloid).