**Core Concept**
The management of hypertension in diabetic patients involves a careful balance between controlling blood pressure to prevent cardiovascular complications and avoiding excessive lowering, which could lead to hypotension and potential organ damage.

**Why the Correct Answer is Right**
The American Diabetes Association (ADA) and the American College of Cardiology (ACC) recommend a blood pressure goal of less than 130/80 mmHg for most adults with diabetes. This is based on evidence that tight blood pressure control can reduce the risk of cardiovascular events, such as heart attacks and strokes, in patients with diabetes. The goal is to prevent end-organ damage, including diabetic nephropathy and retinopathy.

**Why Each Wrong Option is Incorrect**
**Option A:** Blood pressure goals below 120/80 mmHg are not generally recommended for patients with diabetes, as this could lead to excessive lowering and potential organ damage.
**Option B:** A blood pressure goal of 140/90 mmHg is too high for patients with diabetes, as it increases the risk of cardiovascular events.
**Option C:** There is no specific blood pressure goal for patients with diabetes and hypertension, which is incorrect as the ADA and ACC provide clear guidelines.

**Clinical Pearl / High-Yield Fact**
The JNC 8 guidelines recommend a blood pressure goal of less than 140/90 mmHg for most adults with hypertension, but for patients with diabetes, the goal is less than 130/80 mmHg.

**Correct Answer:** D. Less than 130/80 mmHg.