Choosing a story

I had lots of ideas for different genres, so I narrowed it down to one idea for each genre that i could later present my group with.

#1-Thriller
A detective is researching a series of murders and begins to realise that all the evidence leads to one person: Herself.

#2-Horror
A girl is walking away from a creepy stalker who coincidentally chases her so she is in a part of a neighborhood she doesnt recognise. She goes into the only shop she can see and asks for help and she is given a broach of protection which awakens a evil entity who wants to kill her.

#3-Romantic comedy
Boy who works in shop serves a beautiful girl, after flirting for a while she gives him a contact card. Later when he is home he calls her phone and realises shes a acting scout, but he is too embarassed to admit he thought they had relationship potential and agrees to work for her.

#4-Horror
Modern take on the story from mythology; Pandora's box. A girl opens a box which unleashes evil on the world.

After conversing with my group we decided to concentrate on idea #1.