Paint on a new airliner is usually applied in two stages: first, a coat of primer, and then
a top coat. A new process requires no primer, but instead uses two layers of the same
newly developed coating, with each layer of the new coating having the same
thickness and weight as a traditional top coat. Using this new process instead of the
old process increases the price of a new aircraft considerably.
Which of the following, if true, most strongly indicates that it is in an airline's long-term
economic interest to purchase new airliners painted using the new process rather than
the old process?
A. Although most new airliners are still painted using the old process. aircraft
manufacturers now offer a purchaser of any new airliner the option of having it
painted using the new process instead.
B. A layer of primer on an airliner weighs more than a layer of the new coating
would by an amount large enough to make a difference to that airliner's loadbearing
capacity.
C. A single layer of the new coating provides the aluminum skin of the airliner with
less protection against corrosion than does a layer of primer of the usual
thickness.
D. Unlike the old process, the new process was originally invented for use on
spacecraft, which are subject to extremes of temperature to which airliners are
never exposed.
E. Because the new coating has a viscosity similar to that of a traditional top coat,
aircraft manufacturers can apply it using the same equipment as is used for a
traditional top coat.

Let me see if I can explain this one

Question talks about the economic interest of the airplane....So option B explains the economic interest by stating that using the new process the load would be less on the plane and this means that more luggage and more passengers can be accomodated on the plane which in turn means more revenue for the airplane company....so the new coating very well justify the economic interests of the airplane company...

Please let me know if I am correct in my thought process here....

Many thanks!