The correct answer is C. The landscape is dotted by tiny houses.
The other options are incorrect because they do not accurately describe the current state of the landscape. Option A, “The landscape was dotted by tiny houses,” implies that the tiny houses are no longer there. Option B, “The landscape is being dotted by tiny houses,” implies that the tiny houses are still in the process of being placed on the landscape. Option D, “The landscape has been dotted by tiny houses,” implies that the tiny houses have been there for a long time and are now a permanent part of the landscape.
The sentence “Tiny houses dot the landscape” is in the present tense, which indicates that the tiny houses are currently there. The word “dot” means to mark or cover with small spots, which is consistent with the image of tiny houses scattered across the landscape.