Agroup of alveolates that either move themselves or move water past their cell surfaces uning tufts of numerous short flagella like structures. they all have two nuclei, a large macronucleus and a smaller micronucleus. notable examples include: vorticella, balantidium coli, didinium and paramecium.

The answer is CILIATES (Phylum Ciliophora)

Organisms in this phylum typically contain two types of nuclei:
1. The Somatic "macronucleus" and
2. The Germline "micronucleus"

They also possess cilia for locomotion; described as tufts of numerous short flagella like structures. All the organisms listed as examples belong to the phylum Ciliophora.

Your answer is a because that is true