Concept:The question tests the correct spelling of a commonly used English word.
Explanation:Option A, "Allteration", is wrong because it uses an extra "l".
Option B, "Altaration", is wrong because it uses "a" instead of "e" after "t".
Option C, "Alterashion", is wrong because it uses "sh" instead of "t" and adds an extra "e".
Option D, "Alteration", is the correctly spelt word.
It means the act, process, or result of making something different.
For example: "There was a slight alteration in the plan."
Thus, the correct option is D.
Answer:D. Alteration