which - what

[Ekinoksday]

Hello I am new member. I've just come across a question Could explain to me this?

Roughly 100.000 years ago, during the last ice age, wolves migrated from Eurasia to the highlands of ---- is now Ethiophia.

a) that
b) where
c) what
d) which
e) who

Can I use which instead of what in the sentence if not why?

thanks in advance

[Gray]

'Ethiophia' is yet to introduce, therefore 'what' instead of 'which'. I am still learning :)
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First lesson - English, not english. I, not i. ~A student of English

[Ekinoksday]

No sorry but I couldn't understand exactly.... if you explain it again in detail I will understand

[Gray]

We use 'what' to refer to the idea or thing which is yet to introduce in the sentence:

...what is now Ethiophia.

This is how 'which' is used:

...wolves migrated from Eurasia to Ethiophia which is truly a land of contrasts and extremes.

Can someone help me rephrase the above in grammatical terms please?
_________________
First lesson - English, not english. I, not i. ~A student of English

[Ekinoksday]

some teachers claim that according to english grammar rules we have to use WHAT but I insist that we can also use WHICH in the example
What do you think about my opinion?

[Subway]

using WHICH in this sentence would sound very odd, to me. I think the best option is really WHAT but I can't say why.
gray's explanation looks great.
one thing I know about WHICH/WHAT is the the first is used when you have more than one alternative. for example, you say "WHICH one is your pen?".
just a student.