The correct answer is option 'D': halogens.

Halogens are a group of elements in the periodic table that belong to Group 17. They are known for their high reactivity and tendency to form salts. The three elements mentioned in the question, with atomic numbers 35, 53, and 85, are all halogens.

Let's analyze each element individually:

1. Element with atomic number 35:
The element with atomic number 35 is bromine (Br). Bromine is a reddish-brown liquid at room temperature and is the only nonmetallic element that exists in a liquid state. It belongs to the halogen family and is highly reactive. Bromine readily forms compounds with other elements, such as sodium bromide (NaBr) and hydrogen bromide (HBr).

2. Element with atomic number 53:
The element with atomic number 53 is iodine (I). Iodine is a solid at room temperature and appears as shiny purple-black crystals. Like other halogens, iodine is highly reactive and readily forms compounds. It is commonly used as an antiseptic and in the production of iodized salt.

3. Element with atomic number 85:
The element with atomic number 85 is astatine (At). Astatine is a highly radioactive element and is the rarest naturally occurring element on Earth. It is a halogen and exhibits similar chemical properties to the other halogens. Due to its radioactivity and short half-life, astatine is difficult to study and is mainly of scientific interest.

In summary, the elements with atomic numbers 35, 53, and 85 are bromine (Br), iodine (I), and astatine (At), respectively. These elements all belong to the halogen group in the periodic table, making option 'D' the correct answer.