The body charged with the responsibility of preparing a new constitution in a country is...

Explanation

A constituent assembly or constitutional assembly is a body or assembly of popularly elected representatives composed for the purpose of drafting or adopting a constitutional-type document. The constituent assembly is a subset of a constitutional convention elected entirely by popular vote; that is, all constituent assemblies are constitutional conventions, but a constitutional convention is not necessarily a constituent assembly. As the fundamental document constituting a state, a constitution cannot normally be modified or amended by the state's normal legislative procedures; instead a constitutional convention or a constituent assembly, the rules for which are normally laid down in the constitution, must be set up. A constituent assembly is usually set up for its specific purpose, which it carries out in a relatively short time, after which the assembly is dissolved.