Answer:
Option D
Step-by-step explanation:
In simple a dictionary can be seen as a source document under which the meaning and usages of works of a particular languages is given. On the other hand an encyclopedia is not focused on the meaning of any term but the information regarding a particular unit of subject.
Both of these documents possess a great level of information and for teh ease off the readers, information is provided alphabetically. Hence the correct option is D.