Answer:
 a. Canalization
Step-by-step explanation:
Canalization - 
It refers to the type of evolutionary robustness , which is the ability of the population to produce the similar phenotype regardless of the variability of the environment or the genotype , is referred to as canalization . 
It is the method to generate specific genotype in order to follow the same pathway under various conditions . 
Hence , from the given scenario of the question , 
The correct answer is a. canalization .