**Core Concept**
Enteropathogenic E. coli (EPEC) is a pathogenic strain of the bacterium Escherichia coli that causes diarrhea, particularly in infants and children. It is a significant cause of diarrhea in developing countries and is characterized by its ability to adhere to and invade the intestinal epithelial cells.

**Why the Correct Answer is Right**
EPEC adheres to the intestinal epithelial cells through a process called localized adherence, where it forms microcolonies that disrupt the normal intestinal barrier function. This leads to the loss of electrolytes and water, resulting in diarrhea. The pathogenesis of EPEC involves the production of proteins like EspA, EspB, and EspC, which contribute to its ability to adhere to and invade the intestinal epithelial cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because ETEC (Enterotoxigenic E. coli) is a different pathotype that causes diarrhea through the production of heat-labile and heat-stable toxins, rather than adherence and invasion.
**Option B:** This option is incorrect because EHEC (Enterohemorrhagic E. coli) is a different pathotype that causes hemorrhagic colitis through the production of Shiga toxins, rather than adherence and invasion.
**Option C:** This option is incorrect because EAEC (Enteroaggregative E. coli) is a different pathotype that causes persistent diarrhea through its ability to form biofilms and adhere to the intestinal epithelial cells.

**Clinical Pearl / High-Yield Fact**
EPEC is a significant cause of diarrhea in infants and children in developing countries, and its pathogenesis involves adherence to and invasion of the intestinal epithelial cells through the production of specific proteins.

**Correct Answer:** D.