boot – Selecting installation drive

I am new in ubuntu. I want to install ubuntu replacing windows 7 on my laptop . There is 4 partition in my hdd and windows 7 is in “c” drive and the other partitions containing some important files. Now how can I install ubuntu in C drive living other partitions untouched.which one should I select here in the picture

Erase disk ore something else.

Thanks A lot in advance