A lahar is Choose one:

A. a lava lake in a summit crater.

B. a volcanic mudflow that resembles fluid concrete.

C. a collapsed volcanic structure.

D. a glowing cloud of pyroclastic fragments and hot gas.

B. a volcanic mudflow that resembles fluid concrete.

Explanation:

Lahar -

Lahar is a form of debris or mud, basically made up of water, rocky debris and slurry.

Lahar are very devastating in nature as it flows out from the volcano along the river.

The characterstics of Lahar is, it is very large, and dense and viscous in nature.

One of the example if Lahar is,

The Osceola Lahar, originated from the volcano of Mount Rainer in United states, specifically in the aresa of Washington, it covered the area of about 330 square kilometres, with a volume of about 2.3 cubic kilometres.