An important key to good observational records is

Athe use of language.
Btheir length.
Cthe activity of the subject.
Dappropriate format.

Verified Answer :

The answer for this question is letter D. appropriate format. Fair enough, the activity of the subject is equally important. However, if it is organized in a very non-systematic way that the reader of it cannot easily comprehend, then it is useless.

An important key to good observational records is the use of language.