In my store the following scales are offered:
1/87, 1/72, 1/48, 1/35, 1/24, 1/12
 
Which scale is the right one?

1/87: Nominal size H0 for railroads, houses and cars.
1/72: Commonly used for aircraft, vehicles and watercraft, and figures.
1/48: Suitable for tabletop sizes from 25mm to 35mm.
1/35: Equivalent to "54mm Figure Scale" and used in military modeling.
1/24: Suitable for "75 mm Figure Scale".
1/12: Suitable for model cars and motorcycle models.