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a
| pH=0 | pH=4 | pH=8 | pH=12 |
| II | IV | I | III |
b
| pH=0 | pH=4 | pH=8 | pH=12 |
| III | I | IV | II |
c
| pH=0 | pH=4 | pH=8 | pH=12 |
| II | I | IV | III |
d
| pH=0 | pH=4 | pH=8 | pH=12 |
| II | III | IV | I |
answer is B.
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