Recently (in 2003) element with atomic number $110$ has been named by IUPAC as:
(A) $Hs$
(B) $Mt$
(C) $Ds$
(D) $Sg$

Hint: on August $20,\;2003$, the International Union of Pure and Applied Chemistry (IUPAC) council approved the name of the element having atomic number $110$ which was discovered in $2001$ resulted from the fusion-evaporation experiment on using a nickel bean on an isotopically enriched lead target.

Complete Step by step answer:
As we know that the International Union of Pure and Applied Chemistry (IUPAC) council is an authority responsible for the nomenclature of chemicals and elements found. On August $20,\;2003$ at the ${42^{nd}}$ General Assembly, IUPAC officially approved the naming of newly found element with atomic number $110$ which was obtained as a result from the experiment done using $62Ni$ beam on an isotopically enriched $208Pb$ target that produced four chains of alpha-emitting nuclides followed by the formation of element.

It was named as Darmstadtium and the symbol was given as $Ds$ because of its origin in Darmstadt, a place in Germany. This element is a member of d-block, period ${7^{th}}$ and group $10$ and is a highly radioactive synthetic element hence it is not found free in the environment. It was formerly known as Ununnilium. It is one of the most unstable elements so it immediately decomposes to other elements so it is hard to study its physical and chemical properties. Due to its presence in group $10$ it is considered a metal and solid element. It has a half-life of approximately $0.1$ milliseconds therefore it does not have any effect on human health and environment.

Hence the correct answer is (C).

Note: Darmstadtium has an atomic weight of $281$ and electronic configuration $Rn[5{f^{14}}6{d^9}7{s^1}]$. The longer lasting isotope of this element is known which has a half-life of about $20$ seconds. Its chemical properties are not known but considered to be similar to Platinum.