In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
An atom is a smallest constituent unit (1)/ of ordinary matter that has the (2)1 properties of a chemical element. (3)/ No Error (4)

Options

A. 1
B. 2
C. 3
D. 4

Answer

A