The correct answer is D. Regulation of Combinations.
The Competition Act, 2002 is an Act of the Parliament of India enacted to provide for the establishment of a Competition Commission of India to promote and protect competition in the markets, to prevent practices having an adverse effect on competition, to promote economic development, to provide for the regulation of monopolies, and for matters connected therewith or incidental thereto.
The Act prohibits restrictive trade practices, abuse of dominant position, and anti-competitive agreements. It also regulates combinations that have the potential to substantially lessen competition in the relevant market.
However, the Act does not regulate combinations that are not likely to have an adverse effect on competition. This is because the Act recognizes that some combinations may actually promote competition, such as when they lead to increased efficiency or innovation.
In conclusion, the objective of the Competition Act, 2002 is to promote and protect competition in the markets. The Act does this by prohibiting restrictive trade practices, abuse of dominant position, and anti-competitive agreements. It also regulates combinations that have the potential to substantially lessen competition in the relevant market. However, the Act does not regulate combinations that are not likely to have an adverse effect on competition.