This is a Sentence Equivalence question. Both answers must be synonyms that fit the sentence's meaning.

Analysis of the Sentence
1. Identify the relationship: The semicolon (;) indicates that the second clause provides an explanation or example of the first clause.
- First Clause (General Statement): Political leanings become less _______ as we age.
- Second Clause (Example/Definition): The conservative betrays liberal leanings, and the progressive embraces conservative policies.
2. Determine the required meaning: The examples show that people are moving away from their strict, clear, previously defined political positions. They are becoming less rigid or less sharply defined in their views. Therefore, the blank must mean defined, rigid, clear, or visible.

Evaluating the Options
The two correct answers must be synonyms meaning clear, strict, or visible.
- A. demanding: Requires great effort. (Irrelevant to political rigidity).
- B. subtle: Delicate or faint. (Opposite of the needed meaning; the leanings become more subtle, meaning they start less subtle).
- C. pronounced: Very noticeable or conspicuous; strongly marked. (Strong Fit)
- D. biased: Showing prejudice for or against something. (The shift is away from a clear bias).
- E. conspicuous: Standing out so as to be clearly visible. (Strong Fit)
- F. cohesive: Forming a united whole. (Describes the consistency of a platform, not the clarity of a leaning).

The words pronounced and conspicuous both suggest that the political leanings are becoming less noticeable, stark, or firmly established, which is consistent with the examples of cross-party adoption of policies.

The correct answers are C. pronounced and E. conspicuous.