Plasmids -- Question 2

You are interested in using a plasmid as a vector for incorporating foreign DNA into E. coli where it can be cloned. You have four different plasmids (pPLA,pPLB,pPLC,pPLD) from which to choose. Shown on these plasmids are the locations of their origin of replication site (ORI), an ampicillin resistant gene (amp^r), and recognition (cut) sites for two restriction endonucleases (PstI) and HaeII). Click on the best plasmid to use for this purpose.