Answer:
B. Conciseness.
Step-by-step explanation:
An essay can be defined as a written composition about a particular topic, subject or thing.
Basically, the fundamental characteristics of an essay is that it should be clear and concise, so as to enhance an easy understanding by the reader.
Hence, the characteristic of a good school essay is to have 'clarity' and 'brevity'. Brevity simply means conciseness i.e the school essay should be brief but still comprises of all the important points or informations.