E from highlighted text.

Since multinational grain companies operate so as to maximize profits, they
cannot be relied to initiate economic changes that would reform the world’s food distribution
system. Although it is true that the actions of multinational companies sometimes do result in such economic change, this result is incidental,arising not from the desire for reform but from the desire to maximize profits.The maximization of profits normally depends on a stable economic environment, one that discourages change.


The main point of the argument is that
(A) the maximization of profits depends on a stable economic environment
(B) when economic change accompanies business activity, that change is initiated
by concern for the profit motive
(C) multinational grain companies operates so as to maximize profits
(D) the world’s current food-distribution system is not in need of reform
(E) multinational grain companies cannot be relied on to initiate reform of the
world’s food-distribution system

In this para, the main point of argument is started by the sentence
"Since multinational grain companies operate so as to maximize profits, they cannot be relied to initiate economic changes that would reform the world’s fooddistribution system"
After this sentence, author is just providing the arguments to strengthen this comment.

The main point of the argument is that
(A) the maximization of profits depends on a stable economic environment ------> This is just to support author's initial statement.
(B) when economic change accompanies business activity, that change is initiated by concern for the profit motive ----------> This is not mentioned. Out of scope

(C) multinational grain companies operates so as to maximize profits ------> This is a reason as why they can not be relied on. This is not the main point of author.
(D) the world’s current food-distribution system is not in need of reform ------> Out of Scope.
(E) multinational grain companies cannot be relied on to initiate reform of the ---------> Bingo! This is the main point for which author is giving arguments to support.
world’s food-distribution system

IMO - E

Reasoning same as above.

Answer E seems to be logical one out of other answer choices