Answer:
Bad apple (or rotten apple) is indeed defined as “someone who creates problems or causes trouble for others; specifically : a member of a group whose behavior reflects poorly on or negatively affects or influences the remainder of the group.” Versions of the proverb can be found as far back as the early 16th century.
Explanation:
rotten
1 adj If food, wood, or another substance is rotten, it has decayed and can no longer be used.
The smell outside this building is overwhelming<endash>like rotten eggs...
2 adj If you describe something as rotten, you think it is very unpleasant or of very poor quality.
INFORMAL usu ADJ n (Antonym: great) I personally think it's a rotten idea...
3 adj If you describe someone as rotten, you are insulting them or criticizing them because you think that they are very unpleasant or unkind.
INFORMAL usu ADJ n (disapproval, Antonym: nice) You rotten swine! How dare you?...
4 adj If you feel rotten, you feel bad, either because you are ill or because you are sorry about something.
INFORMAL usu v-link ADJ (=awful)
I had glandular fever and spent that year feeling rotten...
