If the choices are:
The suffix in journalism is -ism; it changes the word to mean "the practice of periodical writing of current news."
The suffix in nihilism is -ism; it changes the word to mean "to make nothing."
The suffix in recycle is re-; it changes the word to mean "to process again."
The suffix in preapprove is pre-; to changes the word to mean "to give permission in advance."
The answer is then the first option.
The world Journal is a periodic record of events or news. When you say journalism, it becomes a practice, which is totally different from the meaning of the root word.
We can rule out the last two because pre- and re- are prefixes, not suffixes. We rule out the nihilism example because nihil does not stand on its own. It is a Latin term that means "nothing," and adding -ism just sort of makes the word usable in the English language.