Which statement best explains how Shakespeare transformed the source material, Hecatommithi by Giraldi Cinthio?

The statement that best explains how Shakespeare transformed the source material is:

While Ensign is highly favored and trusted by the Moor, lago is overlooked by the Moor.

lago being overlooked by the Moor, the Moor transformed Iago into a jealous creature.

Explanation:

In Shakespeare’s Othello, Iago's motives are ambiguous and not driven by any lust for Desdemona.

Also in Othello, Shakespeare introduces new characters; they are Roderigo and Desdemona’s father Brabantio.

Cinthio's Gli Hecatommithi is an Italian source for "Othello" and "Measure for Measure" which were written by William Shakespeare.