I need more information to answer the question
Answer:
Rostral
Explanation:
according to google rostral means: situated or occurring near the front end of the body, especially in the region of the nose and mouth or (in an embryo) near the hypophyseal region
Explanation:
Option 1 is 
Property is : 
So, 
Option 2 is 
We can write it as : 
Option 3 is 
Property is : 
So,

It is clear that option a and c are same. But option b is different.