Which of these sentences has an example of an effective writing transition?

The novel about World War II was not very realistic, however it was still enjoyable.

Explanation:

Effective transition allows the theme and important points in an essay to connect for easy comprehension. It is very important that they are present in between the sentences in a body paragraph in order to create organization.  It helps to ensure consistency in the message being conveyed. Pieces of ideas are unified into a whole, and makes the reader flow with the story line. The writer tries to bring different points together using transition. Examples of transitions include:

on one hand, rather, or, nor, contrarily, notwithstanding, but, however.

it is due to the halo effect as the impression of the boy created earlier.on the mind of the principle affected his decision