What are the values of $Z$ for $CO_2, CH_4$,and $O_2$ at $200 \ bar$ and $900 \ bar$ pressure?
- A$Z < 1$ at $200 \ bar$ and $Z > 1$ at $900 \ bar$
- B$Z > 1$ at $200 \ bar$ and $Z < 1$ at $900 \ bar$
- C$Z < 1$ at both pressures
- D$Z > 1$ at both pressures
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