La flecha en una ecuación química significa

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Una reacción química se representa mediante una ecuación química: en el primer miembro aparecen las fórmulas de las sustancias que reaccionan (reactivos) y en el segundo miembro aparecen las fórmulas de las sustancias que se forman (productos), y están separados por una flecha si la reacción es irreversible.

A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). Each individual substance's chemical formula is separated from others by a plus sign.

sorry I posted in English as I m not good in French

hope it helps u

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

no because it could make the world a terrible place to live in.