Identify the level of use of the following sentence.

necessarily, therefore, none of them has the completeness of effect which is so marked in the oresteia .

formal
general
informal
substandard

Formal.

Explanation:

Formal language consists of a vocabulary set that will not normally be used in everyday life situations, but in special occasions which requiere a serious and  professional attitude.

Regarding the example sentence, adverbs such as "Necessarily" and "Therefore" are usually used as text initiators on a formal text, rather than in friendly conversations.

the answer is most likely c. it shows us that the rules that the pigs make can change on a whim whenever it suits the pigs purpose.

hope this

in other words

to put it differently

for one thing

as an illustration

in this case

for this reason

to put it another way

that is to say

with attention to

by all means

important to realize

another key point

first thing to remember

most compelling evidence

must be remembered

point often overlooked

to point out

on the positive side

on the negative side

with this in mind

notably

including

like

to be sure

namely

chiefly

truly

indeed

certainly

surely

markedly

such as

especially

explicitly

specifically

expressly

surprisingly

frequently

significantly

particularly

in fact

in general

in particular

in detail

for example

for instance

to demonstrate

to emphasize

to repeat

to clarify

to explain

to enumerate