Which Group is Most Distantly Related to Green Algae

Question

Which group is most distantly related to green algae?  
A) Ciliates
B) Dinoflagellates
C) Diplomonads
D) Apicomplexans
E) Diatoms

Accepted Answer

Diplomonads are considered to be the most distantly related to green algae based on genetic analysis and other morphological characteristics.