The extreme generalized peripheral edema

A 20-year-old female went to the doctor after noticing a swelling around her eyelids. Once the doctor examined her, he found an extreme generalized peripheral edema. Her abdomen and legs were swollen with some depressions in the clotheslines. Immediately, he asked for some lab tests which showed extreme loss of protein in her urine and decided to perform a biopsy from her kidneys. Eventually, she was diagnosed with minimal change nephrotic syndrome. Which of the following was the cause of her edema, and what did the doctor see within the biopsy that led him to this diagnosis?

A. Edema was due to increased intravascular oncotic pressure, and the biopsy showed flattened podocytes under EM.

B. Edema was due to decreased intravascular oncotic pressure, and the biopsy showed flattened podocytes under EM.

C. Edema was due to increased intravascular hydrostatic pressure, and the biopsy showed swollen podocytes under EM.

D. Edema was due to decreased intravascular oncotic pressure, and the biopsy showed swollen podocytes under EM.