Cellular respiration is essentially:

Explanation

The correct answer is Option A) Oxidation process. Cellular respiration is fundamentally an oxidation process, where organic molecules are broken down to produce ATP, primarily through the loss of electrons. Option B is partially correct because cellular respiration is a redox process, but the primary focus here is on oxidation. Option C is incorrect because the process is not solely about reduction; rather, it includes reduction as part of the redox reaction. Option D is incorrect, as decarboxylation is just one aspect of cellular respiration and does not define the entire process.