It . . . . . . . to me that she was incurable.

The correct answer is suggested.

The word “suggested” means to offer or present an idea or plan for consideration. In this context, it is used to describe the speaker’s realization that the person they are talking about is incurable.

The other options are not as appropriate in this context.

• “Flashed” means to appear suddenly and briefly. This does not accurately describe the speaker’s realization, which was not sudden or brief.
• “Happened” means to take place by chance. This does not accurately describe the speaker’s realization, which was not a chance occurrence.
• “Occurred” means to take place or happen. This is a more general word than “suggested,” and it does not accurately capture the speaker’s sense of certainty about the person’s incurability.