Amended is the once form of the verb, Enrich. Which means to ameliorate or increase the quality as asked . It's deduced from the French word, Enrichir which means to increase the cornucopia of some specific thing. 
let us examine the given options 
A) Adored is the once form of the verb, Adore. Which means to love or respect someone or commodity. 
For illustration The child was adored by all of us. 
We observe that it doesn't mean the same as amended. Hence, option ‘ A ’ isn't the correct option. 
B) respected is the once form of the verb, respect. which means to recommend or appreciate someone or some specific thing. 
For illustration Good people are always respected by all. 
We noticed that it doesn't mean the same as amended. Hence, option ‘ B ’ isn't the correct option. 
C) Fortified is the once form of the verb, fortify. which means to strengthen commodity in order to cover or defend it. 
For illustration The caravansaries were fortified in the wake of demurrers in the council. 
We observe that it doesn't mean the same as amended. Hence, option ‘ C ’ isn't the correct option. 
D) Enhanced is the once form of the verb, Enhance. which means to increase or develop the quality of commodity. 
For illustration Good books are essential to enhance one’s knowledge of the subject. 
We observe that it means the same as amended. Hence, option ‘ D’ is the correct answer. 

Hence, the correct option is Option" D".