Emerson said that the poet was landlord, Sealord, airlord. The flight of imagination made the poet master of land, sea and air. But a poet's dream of yesterday becomes today an actual achievement and a reality for all men. Even those who invented, improved and perfected the aeroplane could hardly have dreamt of the possibility of flight into outer space. The passage best supports the statement that:

The passage discusses Emerson's view of the poet's imagination and how seemingly impossible dreams, such as flight, eventually become a reality. The passage highlights the achievements in the field of flight, particularly the unexpected leap from aeroplanes to outer space. Here's the analysis of the options based on the passage:

1. Option A - seemingly impossible imaginations make one a good poet:
   • The passage mentions the poet's imagination and how it makes them "master of land, sea, and air." However, it does not directly suggest that being able to imagine impossible things makes one a good poet. The focus is on how these dreams become reality, not just the imagination itself.
   
   
   • This option is partially supported but not fully aligned with the passage's emphasis on turning imagination into reality.


2. Option B - all imaginations become a reality some day:
   • The passage does suggest that imaginative ideas eventually turn into reality, but it focuses more on the progression from dream to achievement, rather than asserting that all imaginations become reality.
   
   
   • This option is partially supported but does not fully capture the passage's nuance of effort and development in transforming imagination into reality.


3. Option C - what man imagined has never been impossible; he has always turned it a reality through his conception of ideas and sheer hard labour:
   • The passage supports this idea to some extent, highlighting how what once seemed like impossible dreams, such as flight and space exploration, have been realized through effort and innovation. It emphasizes how dreams of yesterday become achievements of today, suggesting that through ideas and hard work, the seemingly impossible becomes possible.
   
   
   • This option is strongly supported by the passage.


4. Option D - man has reached the climax of technological development with his exploration into outer space:
   • The passage does mention outer space exploration, but it does not imply that this marks the climax of technological development. It focuses more on how ideas evolve from imagination to reality, without claiming that the exploration of outer space is the pinnacle of progress.
   
   
   • This option is not supported by the passage.


5. Final Answer:
   • The best supported statement by the passage is C. what man imagined has never been impossible; he has always turned it a reality through his conception of ideas and sheer hard labour.