'them' or 'theirs'?

Another question makes me need helping is:‘fill in the blank’:
‘‘Tom admired his friends Frank and John.He imitated …
A.every their action B.their every action
C.every action of them D.every action of theirs’’
In my opinion the answer should be C or B. But opposite to mine,the key is D.Help me please!Thanks in advance!
Be my friends!

It seems you may safely use ‘their every action’ without attracting any criticism except for exam purposes, where you stick to ‘d’ for marks.

Hi ,
The answer for this question is D . every action of theirs . Because “every” is not used following to a possessive adjective . This sentence is a usage of possessive adv
i think you should use a good grammar book . It may help you a lot ^-^

Hi Thang77
To me, the use of ‘their every’ in (B) sounds fine. In my opinion, that would also be grammatically correct. Perhaps a more commonly used sentence would be something like this: ‘She hung on his every word.’

However, the word ‘action’ sounds a little bit odd to me in the context. I’d prefer the word ‘move’.

Where did you get this fill in the blank question from?