**Core Concept**
Squamous cell carcinoma (SCC) of the cervix is a type of cancer that originates from the squamous cells lining the cervix. It is a common type of cervical cancer, accounting for approximately 70-80% of cases. The development of SCC is associated with high-risk human papillomavirus (HPV) infection and chronic inflammation.

**Why the Correct Answer is Right**
The correct answer is related to the fact that squamous cell carcinoma of the cervix primarily arises from the ectocervix, which is the visible part of the cervix that projects into the vagina. The ectocervix is lined by squamous epithelium, which is prone to malignant transformation in the presence of high-risk HPV infection. The transformation zone, where the ectocervix and endocervix meet, is a high-risk area for SCC development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be incorrect if it implies that SCC of the cervix is primarily located in the endocervix, which is not true. While some SCC cases may arise from the endocervix, the majority originate from the ectocervix.
**Option B:** This option is likely incorrect if it suggests that SCC of the cervix is not associated with high-risk HPV infection, which is a well-established risk factor for this type of cancer.
**Option C:** This option may be incorrect if it implies that SCC of the cervix is a rare type of cervical cancer, which is not true. SCC is the most common type of cervical cancer, accounting for approximately 70-80% of cases.

**Clinical Pearl / High-Yield Fact**
To remember the difference between squamous cell carcinoma and adenocarcinoma of the cervix, recall that SCC arises from the squamous epithelium of the ectocervix, while adenocarcinoma arises from the glandular epithelium of the endocervix.

**Correct Answer:** C.