**(D) 1 : 8**

**From the question it is given that,**

Width of a picture = 60 cm

Length of a picture = 1.8 m

We know that, 1 m = 100 cm

So, 1.8 m = 180 cm

**Perimeter of rectangle = 2 (length + breadth)**

= 2 (180 + 60)

= 2 (240)

= 480

Therefore, The ratio of its width to its perimeter in lowest form = 60/480

Divide both numerator and denominator by 20.

= 3/24

**Again, divide both numerator and denominator by 3.**

= 1/8

= 1 : 8