Answer:
(B) CHO
Explanation:
A covalent bond is a bond type usually formed between non-metals that have little to no electronegativity differences between them.
Bonds between metals and non-metals are usually ionic in nature. All the other given choices are ionic and a combination of covalent bond.
CHO contains non-metals that are electronegative. There will be sharing of electrons between these atomic species and this will lead to a covalent bond.
