An international auxiliary language (IAL) is a language meant for communication between people from different nations who do not share a common first language. There have been many attempts to construct an IAL, for reasons including the promotion of good relations between different peoples and commercial practicality; perhaps the best known IAL is Esperanto. Three of the answer options are alternatives to Esperanto:

Ido is derived from Esperanto and was specifically designed to be grammatically, orthographically, and lexicographically regular, and above all easy to learn and use. It is the most successful of many Esperanto derivatives

Interlingua is the most widely used “naturalistic” IAL where the vocabulary, grammar and other characteristics are derived from natural languages, rather than being centrally planned. It is based principally on the Romance languages (such as French, Portuguese, Romanian and Spanish).

Novial was devised by Otto Jespersen, a Danish linguist who had been involved in the Ido movement, and later in the development of Interlingua. Its vocabulary is based largely on the Germanic and Romance languages and its grammar is influenced by English.

By contrast Hausa is not an IAL, but is one of the official languages of Nigeria. It is the language spoken by the Hausa people, and is one of a group of about 150 similar languages spoken across northern Nigeria, southern Niger, southern Chad, the Central African Republic, and northern Cameroon.

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