A should not concern themselves about why other countries have been more lucrative than Brazil.
B may be in doubt whether it is true that Brazil will eventually make as much money as countries with vast of natural resources.
C might speculate if Brazil could make more gains if it made a better use of its scarce natural gifts.
D would rather investigate how some countries that are not as rich as Brazil find the means to survive.
E had better analyze why countries with fewer natural resources than Brazil have been more profitable.