Namaste,
Dear members.
I can't choose and prefer one of them in the given context I chose #1 but they said the answer is #2.
Could you help me get it?
- The national museum of history owns fiats of various vintages on account of having evolved into an indian touchstone.
1- on account of their having
2- because they have
3- because of having
4- No Improvement
What's wrong with #3 if #2 is okay?
And why not #4?

Dear members.
I can't choose and prefer one of them in the given context I chose #1 but they said the answer is #2.
Could you help me get it?
- The national museum of history owns fiats of various vintages on account of having evolved into an indian touchstone.
1- on account of their having
2- because they have
3- because of having
4- No Improvement
What's wrong with #3 if #2 is okay?
And why not #4?
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