Sentence Correction

{{{The reason that the word cladistics was chosen to refer to a system of species classification based on the relationships and evolutionary ancestry of groups of organisms is because}}} it is derived from the ancient Greek klados meaning branch.

A) The reason that the word cladistics was chosen to refer to a system of species classification based on the relationships and evolutionary ancestry of groups of organisms is because

B) The reason that the word cladistics is a system of species classification based on the relationships and evolutionary ancestry of groups of organisms is that

C) The word cladistics was chosen to refer to a system of species classification based on the evolutionary ancestry and relationships of groups of organisms because

D) The word cladistics was chosen to refer to a system for the classification of species that is based on the relationships and evolutionary ancestry of groups of organisms because

E) The word cladistics was chosen to refer to a system of species classification based on the relationships and evolutionary ancestry of groups of organisms and

Pls explain your pick and reason for dropping rest.

Source: Master GMAT

A) The reason that the word XXXX is because it is
'it' refers back to the main subject 'the reason' instread of 'the word'
The construction is wordy and awkward but looks gramatically OK except for 'it' issue

B) Changes the meaning totally by incorrectly mentioning the word is a system of XXX

C)Looks Ok for now

D)"for the classification of species that is based on the"
I think this construction changes the meaning.
i)a system for the classification of species is not equivalent to a system of species classification

E) Causal relationship is not maintated by the replacement of because with 'and'

My pick is 'C'

I also pick C through two contenders B & C

D > C.. 'system of species classifications' sounds uneasy.

satishchandra wrote:A) The reason that the word XXXX is because it is
'it' refers back to the main subject 'the reason' instread of 'the word'
The construction is wordy and awkward but looks gramatically OK except for 'it' issue

B) Changes the meaning totally by incorrectly mentioning the word is a system of XXX

C)Looks Ok for now

D)"for the classification of species that is based on the"
I think this construction changes the meaning.
i)a system for the classification of species is not equivalent to a system of species classification

E) Causal relationship is not maintated by the replacement of because with 'and'

My pick is 'C'