**Core Concept**
The glomerular filtration barrier is a selective filter that allows certain substances to pass through while restricting others. This process is crucial for the formation of urine and the regulation of fluid balance in the body.

**Why the Correct Answer is Right**
Substances that are freely filtered across glomerular capillaries are those with a molecular weight of less than 60,000 Da, are not protein-bound, and are lipid-soluble. This includes water, ions, glucose, and small organic molecules. The glomerular filtration rate (GFR) is the rate at which these substances are filtered from the blood into the Bowman's space.

**Why Each Wrong Option is Incorrect**
**Option A:** This is not a valid option.
**Option B:** This is not a correct statement.
**Option C:** This is not a correct statement.
**Option D:** This is not a correct statement.

**Clinical Pearl / High-Yield Fact**
The size of the molecule is a critical factor in determining whether it is freely filtered across the glomerular capillaries. Molecules with a molecular weight above 60,000 Da are generally restricted from filtration due to their size.

**Correct Answer:** None of the above options are correct as the question is missing the options.