The strategy that French authorities use to dominate their colonies in Indochina is Forcing poor farmers to pay high taxes Option(d) is the correct.
The French relatively came to develop colonies in Indo-China, or as known as Vietnam, during the process of majorly spreading Catholicism through the overall missionaries sent far all the way to Asia country over a period of time.
When they merely gained actual control over Vietnam, they began to assert basically their dominance over the region. They did so, by letting the French Cultural practices usually in Vietnam.
Therefore Option(d) is correct.
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