Answer: B. Alice works with natural rubber, and Julio with vulcanized rubber.
Step-by-step explanation:
A natural rubber is an elastic substance obtained from the latex of the trees. Due to the elasticity the rubber is used for the manufacture of tyres. Vulcanized rubber is a synthestic rubber produced by the treatment of natural rubber with sulfur and other chemicals. Vulcanized rubber is more flexible, resistant to heat and environment conditions as compared to natural rubber.
On the basis of the above description, Alice should work with natural rubber and Julio with vulcanized rubber.