Hi anon, I prefer b, though I hear a in conversations. Hope that helps.
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The above sentence cannot be correct because of the verb "thinks" which is used with "third person singular"only.
a) Every mother thinks their baby is the cutest.
...it's "their" which makes "mother" plural.
Mother is third person singular. Plural of mother is mothers. You are assuming that 'every' makes the sentence plural. Think of the phrase as having a missing that
Should be, ".......when it's strictly UNnecessary."
....when it's not strictly necessary.
RwilesI agree with Julie, however as a native English speaker I would always choose a over b
Weird. As a native English speaker I would choose b over a. But I did attend a Grammar school!