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Having figured out what to do, the protagonist says「これで決定」. Later, having
picked one option out of several, she says 「これに決めた」.

What's the difference in the meaning between these, and why are the particles
different (で / に)?
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2020-06-02T13:05:31.343
77781
2020-06-03T07:17:30.847
2020-06-03T07:17:30.847
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question
meaning particles
これで決定 vs これに決めた
I think these two これs are referring to different things.

In **これで** 決定, これ is referring to the current situation (i.e. what just
happened) so a translation would be "and with this/because of this, I have
decided". This これ is not talking about **what** was decided. [See this
link](https://japanese.stackexchange.com/questions/25698/what-is-
the-%E3%81%93%E3%82%8C%E3%81%A7-in-%E3%81%93%E3%82%8C%E3%81%A7%E5%A4%B1%E7%A4%BC%E3%81%97%E3%81%BE%E3%81%99).

In これ **に** 決めた, これ **is** talking about what was decided. "I decided **on**
this".
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2020-06-02T13:45:53.883
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2020-06-02T13:45:53.883
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answer