**Core Concept**
N2O (nitrous oxide) anesthesia can interfere with oxygen delivery to tissues by diluting the partial pressure of oxygen in the blood and by impairing the body's ability to utilize oxygen due to its effect on myoglobin and other oxygen-carrying proteins. This phenomenon is known as "oxygen displacement" or "oxygen washout."

**Why the Correct Answer is Right**
When a patient is recovering from N2O anesthesia, there is a risk of hypoxia due to the residual effects of N2O on oxygen metabolism. Administering 100% oxygen helps to rapidly eliminate the remaining N2O from the body, restore normal oxygenation of tissues, and prevent potential complications such as hypoxia, methemoglobinemia, or even seizures. The administration of 100% oxygen also helps to counteract the N2O-induced shift of the oxygen-hemoglobin dissociation curve to the left, thereby facilitating the release of oxygen to tissues.

**Why Each Wrong Option is Incorrect**

**Option A:** This option may seem plausible, but it is not directly related to the specific issue of N2O anesthesia. While oxygen therapy is always beneficial, the specific context of N2O anesthesia requires a more nuanced understanding of the underlying physiology.

**Option B:** This option is incorrect because the primary concern with N2O anesthesia is not its potential for causing respiratory depression, but rather its ability to displace oxygen and impair oxygen utilization.

**Option C:** This option is incorrect because the administration of 100% oxygen is a specific treatment for the residual effects of N2O anesthesia, rather than a general precaution for all anesthetics.

**Clinical Pearl / High-Yield Fact**
To remember the importance of administering 100% oxygen after N2O anesthesia, recall the mnemonic "N2O-NOT": "Nitrous Oxide Not Normal Oxygen." This mnemonic emphasizes the need for special precautions when recovering from N2O anesthesia to prevent potential complications.

**Correct Answer:** C. The administration of 100% oxygen helps to rapidly eliminate the remaining N2O from the body, restore normal oxygenation of tissues, and prevent potential complications.