Followers of Douism believe that Duo is A. Proper relationships between people.

B. A form of ancestor worship

C. The natural way of the universe

Followers of Daoism believe that Duo

The most important of these concepts are (1) the continuity between nature and human beings, or the interaction between the world and human society; (2) the rhythm of constant flux and transformation in the universe and the return or reversion of all things to the Dao from which they emerged; and (3) the worship of ancestors, the cult of heaven, and the divine nature of the sovereign.

Explanation:

Taoism, also known as Daoism, arose about the same time as Confucianism. ... Taoist thought focuses on genuineness, longevity, health, immortality, vitality, wu wei (non-action, a natural action, a perfect equilibrium with tao), detachment, refinement (emptiness), spontaneity, transformation and omni-potentiality.

Metric Conversion Act- requires US government programs to use SI units.

U.S. Metric Study- advisory panel to consider the feasibility of adopting the  metric system.

Treaty of the Meter- established a uniform and standardized metric system.

Explanation:

The history of the adoption of the Metric System was first proposed in 1790 by the nations of France and the US. This led to the adoption of the current standardized unit SI unit that is used all over the world.

The given official titles and their descriptions are given as below-

Metric Conversion Act- requires US government programs to use SI units.

U.S. Metric Study- advisory panel to consider the feasibility of adopting the  metric system.

Treaty of the Meter- established a uniform and standardized metric system.