LIBERAL :

Let's look at each option:
Option A: Broad-minded means having or showing an open, tolerant attitude.
Option B: Generous means showing a readiness to give more of something, especially money, than is strictly necessary or expected.
Option C: Visionary means thinking about or planning the future with imagination or wisdom.
Option D: Imaginative means having or showing a tendency to form new, often unconventional ideas.
Think about the word "liberal." It often describes someone who is open to new ideas and willing to accept different viewpoints. This matches the meaning of "broad-minded."
While "generous" can sometimes relate to a liberal person (like being liberal with their money), it's not the *primary* synonym.
"Visionary" and "imaginative" are related to creativity but not directly to the core meaning of "liberal."
Therefore, the best synonym for "LIBERAL" is "broad-minded."