Is my design for this drain-waste-vent system acceptable?

I'm designing a drain-waste-vent system to handle two baths and laundry. I'll be tying into 4" ABS sewage line, that has a 2 inch vent (See figure 1). It's a Single story house with crawl space, in Southern California with very moderate temperature. All venting will go straight up through roof.

Questions:
Are there enough vents (i.e. does the washing machine need its own vent)? Is the location of the vents correct? Is the plumbing sized correctly? Any problems with this design?
[![Existing Plumbing][1]][1]
Figure 1

Figure 2

The floorplan for Bathroom B has changed and now I have a new design. Many thanks to forum participants for all their tips. Please let me know if I am on the right path to a good and UPC code worthy design. Is the venting correct?


#Plumbing