D to Db is a half step. Look at the keys B and C on the keyboard, there is no key in between them which means it is a half step. A whole step is two keys up (either black or white) therefore, D to Db would be a half step.
The answer is
<span><span>B.They could use a similar style of sculptural decoration on all of the exterior and interior walls.</span><span><span> C.</span>They could use pleasing proportions for all the parts of the building.</span><span><span> D.</span>They could use the same kinds of shapes, colors, textures, and forms as in the natural or man-made surroundings.</span><span><span> E.</span>They could add a fountain, gateway, or sculpture that has the lines, forms, colors, or images of the art museum.</span></span>
