**Core Concept**
A dentigerous cyst is a type of odontogenic cyst that forms around the crown of an unerupted tooth, particularly in the mandible. It is characterized by a fluid-filled sac that can expand and exert pressure on surrounding tissues, leading to various effects.

**Why the Correct Answer is Right**
A dentigerous cyst can cause expansion of the cortical bone, leading to displacement of the tooth, and even resorption of the roots of adjacent teeth. The pressure exerted by the cyst can also cause deformation of the surrounding bone, and in severe cases, it can lead to ankylosis of the adjacent teeth. Furthermore, the cyst can cause displacement of the roots of adjacent teeth, leading to ankylosis or resorption.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a dentigerous cyst can indeed cause expansion of the cortical bone, leading to displacement of the tooth, and even resorption of the roots of adjacent teeth.

**Option B:** This option is incorrect because a dentigerous cyst can indeed cause deformation of the surrounding bone, and in severe cases, it can lead to ankylosis of the adjacent teeth.

**Option C:** This option is incorrect because a dentigerous cyst can indeed cause displacement of the roots of adjacent teeth, leading to ankylosis or resorption.

**Clinical Pearl / High-Yield Fact**
It is essential to note that dentigerous cysts are often associated with impacted teeth, particularly the third molars, and can cause significant expansion and deformation of the surrounding bone.

**Correct Answer: Not Given**
Please provide the correct options for the question so that I can complete the explanation.