**Core Concept**
The **renal physiology** of glucose absorption is crucial for maintaining glucose homeostasis. The **proximal convoluted tubule (PCT)** plays a significant role in glucose reabsorption. Nearly all glucose that is filtered by the glomerulus is reabsorbed in the PCT.

**Why the Correct Answer is Right**
The correct answer is based on the fact that almost all glucose is reabsorbed in the PCT. This process is mediated by **sodium-glucose cotransporters**. The PCT reabsorbs approximately 100% of filtered glucose, unless the glucose load exceeds the transport maximum.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the amount of glucose reabsorbed.
**Option B:** This option is also incorrect as it does not accurately reflect the high efficiency of glucose reabsorption in the PCT.
**Option D:** This option is incorrect because it suggests that a significant amount of glucose is not reabsorbed, which is not the case under normal conditions.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the PCT's ability to reabsorb glucose is nearly maximal under normal conditions. This is crucial for understanding how certain conditions, like diabetes, affect glucose handling by the kidneys.

**Correct Answer:** D. 100%