Columbus gives several reasons for giving the indigenous people "many beautiful articles." The applicable reasons from your list would typically include:
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to manipulate them so that they may become Christian: Columbus often framed his encounters with indigenous peoples in terms of spreading Christianity.
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to start fair trading with the indigenous people: Establishing trade relationships was a common goal for European explorers.
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to influence indigenous people to find and bring to Columbus what he needed: Offering gifts could be a way to encourage indigenous peoples to help him find resources such as gold.
The other options about showing that Europeans have more gold or respecting the indigenous religious system do not generally align with Columbus's typical motives as recorded in his writings.