17. The melting points of the oxides of the third-period elements are given below. How many oxides are the molecular solids?

Na₂O (1275 °C), MgO (2800 °C), Al₂O₃ (2045 °C), SiO₂ (1610 °C), P₄O₆ (23.8 °C), SO₃ (16.8 °C), Cl₂O₇ (-91.5 °C)
(A) 1
(B) 2
(C) 3
(D) 4
(E) There is no correct answer.

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