**Core Concept**
The underlying principle being tested is the diagnosis of **precocious puberty**, specifically the identification of the hormonal imbalance causing the symptoms. This condition involves the early onset of pubertal changes, which can be due to various causes including **adrenal** or **gonadal** disorders.

**Why the Correct Answer is Right**
Given the symptoms of pubic hair development, increased pigmentation of the genitalia, phallic enlargement, and hypertension, the most likely cause is an excess of **androgens**. The measurement of **17-hydroxyprogesterone** or **11-deoxycortisol** could be relevant, but the key symptom here - hypertension, along with virilization symptoms - points towards an excess of **mineralocorticoids** and **androgens**, which is characteristic of **congenital adrenal hyperplasia (CAH)**, specifically **11-beta hydroxylase deficiency**. However, without specific options, we focus on the principle that the diagnosis involves identifying the hormone responsible for the virilizing and hypertensive effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option text, we cannot directly address why it is incorrect, but generally, options that do not directly relate to the measurement of hormones involved in adrenal steroidogenesis or gonadal function would be incorrect.
**Option B:** Similarly, without the text, we assume it might not directly relate to the diagnostic hormone for the condition described.
**Option C:** This option, if not related to adrenal steroid hormones, would be incorrect.
**Option D:** Assuming this option does not align with the expected hormonal imbalance, it would be incorrect.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **hypertension** in the context of precocious puberty, especially with virilizing features, should prompt an investigation into **adrenal causes**, such as **congenital adrenal hyperplasia** or **adrenal tumors**.

**Correct Answer:** Correct Answer: D. 17-hydroxyprogesterone