Answer: for justice
In the statement " Many groups worked diligently for justice", the complete prepositional phrase is "for justice". A preposition presents or shows the relationships of the different elements in the sentence therefore, a prepositional phrase commonly is made up of a preposition and an object of the preposition. In the statement above, the presposition is "for" while the object of the preposition is the word "justice". It is very easy to spot a prepositional phrase because they neither have a subject nor a verb but prepositional phrase adds or leads the readers to more information .
<span>But one day Tanovo’s rival, chief of the volcano Nabukelevu, pushed his mountain up and blocked Tanovo’s view of the sunset. Enraged at this, and robbed of the pacifying effects of his daily meditation, Tanovo wove giant coconut-fibre baskets and began to remove earth from the mountain. His rival, however, caught Tanovo and chased him away. Tanovo, in his flight, dropped earth at the islands of Dravuni and Galoa.</span>
The last one.
Create a bibliography so you can make sure you've cited sources correctly.