In the reaction $4K_2Cr_2O_7 \xrightarrow{\text{heat}} 4K_2CrO_4 + 3O_2 + X$,the species $X$ is:
- A$CrO_3$
- B$Cr_2O_7$
- C$Cr_2O_3$
- D$CrO_5$
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