After some researching, I believe the best option to be the last one: Gandhi conveys his point of view about arranged marriages.
From the excerpt available in the question, we can tell Gandhi did use figurative language to convey his ideas. When he stated that Ethiopians are the sons of Adam, he meant all people are part of the same family - humankind - and deserve to be respected.
Gandhi is mostly famous around the world for his belief in non-violent resistance, which makes to second option valid.
As for the third option, in his book The Story of My Experiments With Truth, Gandhi did advocate against child marriage. Gandhi himself got married when he was only 13 and sees that fact as an atrocity.
In conclusion, the statement that does NOT align with his point of view seems to be the last one.