The traits which are controlled by more than one gene are known as:

The correct answer is Option (1) → Polygenic traits

Option (1) Polygenic traits — Correct. Traits such as human skin colour are controlled by three or more genes, each adding a little to the effect. Such traits are called polygenic traits.

NCERT Extract:
Polygenic Inheritance – “Mendel’s studies mainly described those traits that have distinct alternate forms such as flower colour which are either purple or white. But if you look around you will find that there are many traits which are not so distinct in their occurrence and are spread across a gradient. For example, in humans we don’t just have tall or short people as two distinct alternatives but a whole range of possible heights. Such traits are generally controlled by three or more genes and are thus called as polygenic traits.”