Answer:
D. Romanian
Step-by-step explanation:
The majority of the population in Moldova is Romanian. The percentage of people with Romanian ancestry is around 82%. While this is the case when it comes to the ancestry of the people, lately there has been a dramatic change in what the people started to declare themselves to be ethnically.
On big displeasure of Romania, the people of Romanian ancestry in Moldova started to declare themselves as Moldovan. This has resulted in around 75% of the population to now be declaring as ethnic Moldovan, while only around 7% stood to the traditional declaring of being Romanian. This makes the Romanians the second largest ethnic group officially in Moldova now.
Other ethnic groups in this country are the Ukrainians, Russians, Gagauz, Bulgarians...