Some antique mystery car photos - looking for help

I have these antique photographs. I'm hoping to find a little more identifying information about the cars. Any help appreciated!

A (two pics) dated 1931
http://imgs.inkfrog.com/pix/alderman/Screen_Shot_2016-09-30_at_8.34.10_AM.png
http://imgs.inkfrog.com/pix/alderman/Screen_Shot_2016-09-30_at_8.34.27_AM.png

B "Ford" visible on spare tire
http://imgs.inkfrog.com/pix/alderman/Screen_Shot_2016-09-30_at_8.34.43_AM.png

C caption "our new Olds car"
http://imgs.inkfrog.com/pix/alderman/Screen_Shot_2016-09-30_at_8.35.16_AM.png

D police wagon
http://imgs.inkfrog.com/pix/alderman/Screen_Shot_2016-09-30_at_8.35.08_AM.png

"B" is a Ford Model A 1928-1931;
"D" is a Ford Model T Depot Hack, maybe from the teens.

"A" is a late 20's Buick Roadster I believe