Answer:
<em>'He is the same colour </em><em>as </em><em>the earth, and a great deal less interesting to look at.'</em>
Explanation:
George Orwell uses Simile, a figurative language device that compares two things using the adverbs like or as.
When describing the people working on the land he refers to them as the unvisible part of a (beautiful) visible landscape. This is a very subtle way of critisizing the British Empire that ignores (they don´t see them) the working people who, seen by Orwell, are doing important work.
I believe your answer is A because almost all people with knowledge know that grass is green. Someone would only ask this if they weren't for sure, such as someone being color blind. Hope this helped!
Thanks!
~Steve