Explanation:

- Let's analyze each number:

- 166: Even number.

- 341: Odd number, and it is not divisible by 2.

- 132: Even number.

- 209: Odd number, and it is not divisible by 2.

- Similarity: 341 and 209 are odd, 166 and 132 are even.

- Two numbers (166, 132) are even, two (341, 209) are odd, so that's not unique.

- On checking further: 341 = 11 × 31 (composite), 209 = 11 × 19 (composite), 132 = 11 × 12 (composite), but 166 = 2 × 83. The standout difference: 83 is prime, but all numbers are composite.

- Let's check by adding the digits:

- 166: 1+6+6=13

- 341: 3+4+1=8

- 132: 1+3+2=6

- 209: 2+0+9=11

- Let's check divisibility by 11 (noticing that all can be divided by 11 except possibly 166):

- 166 ÷ 11 = 15.0909...

- 341 ÷ 11 = 31

- 132 ÷ 11 = 12

- 209 ÷ 11 = 19

- So, all numbers except 166 are divisible by 11.

Correct Answer: Option: 1 - 166