Concept:Both silicon and germanium are group 14 elements with similar electronegativities, so they share electrons.Explanation:Silicon and germanium are non-metals/metalloids that form bonds by sharing electron pairs.There is no electron transfer, so the bond is not ionic or electrovalent.A dative bond requires one atom to donate both shared electrons, which is not the case here.Therefore, the bond between silicon and germanium is a covalent bond.Answer:A. covalent