Before going to write answer, firt we need to know What is Like Decimals and UnLike Decimals
Like Decimals
Decimals having the same number of decimal places are called like decimals i.e. decimals having the same number of digits on the right of the decimal point are known as like decimals
Unlike Decimals
Decimals having different number of decimals places are called Unlike decimals
So in the given above options
a) 1.7, 2.35, 7.135, 5.50
b) 0.9, 0.99, 9.99, 9.999
d) 0.5, 0.56, 0.567, 0.5678
these options having different number of decimals places
option c) 3.2,4.8,5.2,6.7
having the same number of decimals afer decimal point,
so option C is like decimal
We can convert UnLike Decimals inot Like decimals like below
a) 1.7, 2.35, 7.135, 5.50 these are unlike decimals to convert them to Like decimals