**Core Concept**
Local anesthetics can cause systemic toxicity due to their ability to cross the blood-brain barrier and affect the central nervous system. The lipid solubility and pKa of local anesthetics play a crucial role in determining their potential for systemic toxicity.

**Why the Correct Answer is Right**
Systemic toxicity is more likely to occur with local anesthetics that have a higher lipid solubility and a more basic pKa. This is because these properties allow the drug to more easily cross the blood-brain barrier and bind to sodium channels in the central nervous system. For example, **Bupivacaine** has a high lipid solubility and a pKa of around 8.1, making it more likely to cause systemic toxicity compared to other local anesthetics like **Lidocaine**.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because it does not provide a clear characteristic that would increase the risk of systemic toxicity.
**Option B:** This option may be tempting, but it is actually incorrect because while a higher dose may increase the risk of systemic toxicity, it is not the most important factor. Other properties like lipid solubility and pKa are more critical in determining the risk of systemic toxicity.
**Option D:** This option is incorrect because while a specific technique may affect the absorption of the local anesthetic, it is not the most important factor in determining the risk of systemic toxicity.

**Clinical Pearl / High-Yield Fact**
When administering local anesthetics, it's essential to remember that the **"rule of twos"** states that systemic toxicity is more likely to occur with local anesthetics that have a pKa between 7-9 and a lipid solubility (octanol-water partition coefficient) of more than 100.

**Correct Answer: B.**