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Are these variants correct?[/quote]

They are both just fine. Other variants could be:

"What made you decide to learn Russian?"
"Why did you decide to learn Russian?"
"Why did you choose to...

Yes, I did mean Сан-Диего. Thank you. :-) I tried to build letter by letter using this site. Oh well, I came close though!

I decided to learn Russian because it seemed like a fun language to learn. Since I live in SoCal, Spanish would seem like a much wiser choice so I'm learning that one too. But I'm not too far in...