Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)
Dawn - Sunrise

Correct option is C

Logic: Dawn is the time of morning when the sun is 6° below the horizon, while sunrise is when the first part of the sun becomes visible in the morning.
Easy means something is achieved without effort. 
Simple means something is uncomplicated and easily understood. 
Explanation:
As, Dawn and Sunrise are synonym words.
Similarly,
Easy and Simple are synonym words.