What is the SI system of measurement made up of?

a. An array of units that have no obvious interrelationship, such as inches (in.), feet (ft), yards (yd), miles (mi), ounces (oz), pounds (lbs.)
b. Each prefix is a fraction or multiple of the number 10, such as cm, mm, m, km
c. Measurements called chains
d. Increments of rods

B