The pattern is given in the question as below.
E → (i)
R → (ii)
D → (iii)
I → (iv)
S → (v)
P → (vi)
Try to form a word by arranging the letters for all given option one by one.
Arranging to given word in question ,we get the meaningful word -
S → (v)
P → (vi)
I → (iv)
D → (iii)
E → (i)
R → (ii)
Hence , the required answer will be SPIDER.