The late-19th-century artists, both in europe and america, insistence that paintings are independent artworks and not windows opening onto the world.

a. three-dimensional; two-dimensional;
b. one-dimensional; two-dimensional
c. unique; real
d. two-dimensional; three-dimensional

Option D is correct

Explanation:

This is due to the naming of their two dimensional work which is usually on a canvas ABSTRACT names or use of abstract terms to depict their work which makes it unrealistic with the three dimensional world or untreatable with life.

i think it was   tsar alexander ii

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.