All three of the listed events can cause tsunamis:
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Earthquakes: The most common cause of tsunamis, especially those that occur under the ocean. When tectonic plates shift during an earthquake, they can displace a large volume of water, creating powerful waves.
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Volcanism eruption: Volcanic eruptions, particularly explosive ones that displace water or collapse volcanic islands, can also generate tsunamis. The eruption can lead to the rapid displacement of water, causing waves.
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Landslide: Landslides, whether they occur underwater or when material falls into the ocean from land (such as coastal landslides), can also trigger tsunamis. The sudden displacement of water masses can result in large waves.
Thus, earthquakes, volcanic eruptions, and landslides can all be potential causes of tsunamis.