A lahar is produced whenash is blown out of a vent and onto the side of the volcanoash and other pyroclastic ejecta become saturated with watera lateral blast spreads ash across a large areaa lava flow breaks apart on the steep portion of a composite cone

the side of the volcanoes and other pyroclastic ejecta become saturated with water

Explanation:

A pyroclastic flows can generate the lahar when they are extreme ty hot and flows with the rocks bedrock. This debris mixes up with the snow met and ice and gets rapidly traveled upwards. It travels rapidly down steep slopes and a larger can also be formed when a high volume of long duration of rainfall occurs after the eruption. And the volcanic landslides are mixed with water.

Ithink d would be correct