<h2>
Answer:</h2>
Option: d is the correct answer.
     d.   Transitive Property of Congruence
<h2>
Step-by-step explanation:</h2>
Transitive Property of Congruence--
It states that if for any three elements a,b and c of a set A are such that:
a is related to b by some relation R  i.e.  aRb
and b is related to c by the same relation R  i.e.  bRc
then a will be related to c by the relation R i.e. aRc
Here we have: 1=2
i.e. 1 is related to 2 by a equality sign
and 2=4 
i.e. 2 is related to 4 by a equality sign.
Then 1 will be related to 4 by the same equality sign
i.e.   1=4 (By the property of transitive property of  congruence)