Chemistry question structural formula

Practice Question Solving
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sorry I did not have an eraser with me so I couldn’t erase my writing but can someone explain in simple terms what the answer should be? Thanks!

2

Hi!

In my opinion the answer is A).
K2O ; KCl ; IBr have single bonds
CaS has a double bond BUT it’s ionic not covalent
NO is a weird molecule to draw since it’s an exception to the octet rule, but it has a double bond