Here are some words translated from an artificial language.
I. mallonpiml means blue light
II. mallontifl means blueberry
III. arpantifl means raspberry

Which word could mean "lighthouse"?

Mallon means blue; pimlmeans light; tifl means berry; and arpan means "rasp" in raspberry. The word piml, which means light, is required for the word lighthouse. That rules out choices a and c. Arpan in choice b means "rasp", so that rules out choice b. That leaves choice d the only possible answer.