Answer:
The type of protagonists that is common to psychological suspense is ambiguous. The correct answer is the last one.
Step-by-step explanation:
It is very normal that, in a suspense story, the main character is a person who has different types of attitude during the tale. That is why sometimes it not so easy for the reader to notice nature of this person; if he/she is a good, but troubled one that has reasons from the past to act the way he/she does, or if his/her nature is just evil. Also, the protagonist can have a friendly, loving attitude with some people, and have a bad one with others. He/she can also suffer from a disease, and that can be the reason for him/her to act like that (being a psychopath, for example), or simply have a mental illness, etc. That is why sometimes their attitude can be ambiguous, and it is not so easy to tag them.