Peter the great reduced the power of the boyars by ending all plans for conquest and territorial expansion. introducing the eastern orthodox religion to russia. hiring european military advisers. introducing a merit system of nobility.

The boyars are members of the ruling nobility in medieval Russia along with some other Slavic countries. They were assumed to be most important for the jobs in the army.

The correct answer is - introducing a merit system of nobility.

During the 18th century, Tsar Peter was known as the great ruler having maximum powers. As Peter, the Great was very much fond of boyars and the way the Boyars work in a well-organized manner led Peter to introduce the merit system of nobility for the Boyars instead of rapid decline in the influence from Boyars.

To know more about Boyars, refer to the link:

link

The correct answer is - introducing a merit system of nobility.

The boyars were the most influential people in Russia, apart from the king/tsar himself, for few centuries. They were rich people that owned a lot of land, and they served as advisers of the king/tsar, as well as having council in which they were deciding pretty much everything for the country. In a way, it can be said the the boyars were rich and influential people that served as some ofrm of parliament.

In the 18th century though, Tsar Peter the Great came to power, and he was not very fond of the boyars and how that system worked, so he intorduced a merit system of nobility instead, and the boyar's influence rapidly declined.

d is the logical answer but im not a 100% sure