Upon reviewing this essay and realizing that some information has been left out, the writer composes the following sentence, incorporating that missing information:
If you own a computer, it is vital to understand it, for noxious software is becoming increasingly sophisticated and infectious.
The most logical and effective place to add this sentence would be after the last sentence of Paragraph:
F. 2.
G. 3.
H. 4.
J. 5.