Which of the following best summarizes the fourth paragraph?
a.
after many years of experimentation, nicolas appert and peter durand each worked out techniques that people stop wasting food needlessly.
b.
in many cases, aluminum cans held different kinds of beverages because they were considered to be lighter than tin and did not rust easily.
c.
durand's tin cans were tougher than appert's glass jars, and therefore, they were easier to carry and transport for many food companies.
d.
durand's tin-can preservation method made the transportation of food easier because of the tin's durability, and it also develop the aluminum can.