**Core Concept**
The mandible is more prone to bone loss after tooth loss due to its unique anatomical and physiological characteristics, such as a smaller cortical bone thickness and a greater reliance on the alveolar bone for support. Additionally, the posterior region of the mandible is more susceptible to bone loss than the anterior region due to differences in the distribution of occlusal forces and the presence of the mental foramen, which can lead to increased bone resorption.

**Why the Correct Answer is Right**
The mandible has a smaller cortical bone thickness compared to the maxilla, making it more susceptible to bone loss after tooth loss. The posterior region of the mandible is subjected to greater occlusal forces, particularly in the molar and premolar areas, which can lead to increased bone resorption and loss. Furthermore, the presence of the mental foramen in the anterior region of the mandible can lead to increased bone resorption, as the nerve and blood vessels that pass through this foramen can cause localized bone loss.

**Why Each Wrong Option is Incorrect**
**Option C:** The 1st statement is true, but the 2nd statement is false. This option is incorrect because the posterior region of the mandible is indeed more susceptible to bone loss than the anterior region.

**Option D:** The 2nd statement is true, but the 1st statement is false. This option is incorrect because the mandible is more prone to bone loss after tooth loss than the maxilla, not the other way around.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the rate and extent of bone loss after tooth loss can be influenced by various factors, including the presence of periodontal disease, the distribution of occlusal forces, and the individual's overall oral health. Regular dental check-ups and proper oral hygiene can help mitigate the risk of bone loss and preserve the integrity of the alveolar bone.

**✓ Correct Answer: A. Both statements are true**