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a, c are true statements

Explanation:

First statement concludes that only the slower stage or the rate deciding phase of the reaction allows for the rate law to be calculated. This is true

The second declaration is not valid in all regards, because we can not evaluate the correct rate law by just observing the net equation. It needs to be determined experimentally.

In the third statement, most of the bimolecular reactions are second order in general, since two reactants exist. Hence, it is true

The fourth declaration is wrong. To measure the rate of each elemental phase accompanying the response, we must observe the rates