Sentence Correction

Hi All ,

Going through a couple of SC question i'm confused about a part in sentence structure .
which is more favourable mark as ( RIGHT,SUSPECT,WRONG) ?
Also if you are marking more than one right assign a priority if those 2 similar choices are a part
of a single question .

1) because a , because b and because c .
2) becuase a,b and c .
3) because a,b and because c

I am not an expert but here's my understanding.

It would have been nice if you had given complete sentences instead of just structures.

I hope a, b and c here represent clauses, otherwise all options are wrong.

If a, b and c represent clauses then

Eg: Two new studies indicate that many people become obese more because their bodies bum calories too slowly than because they eat too much

In the above sentence, the idiom is "more X than Y". Here X and Y need to be parallel. We need to use "because" at both places.

Same rule applies to the following idioms (Its not an exhaustive list):
"¢ Both X and Y
"¢ Either X or Y
"¢ Neither X nor Y
"¢ Not only X but (also) Y
"¢ Not X but (rather) Y
"¢ Not so X as Y

"X and Y" or "X, Y and Z" parallelism

For "X and Y" parallelism, I am little confused between "because a , because b and because c" and "becuase a,b and c.". "because a,b and because c" is wrong for sure.

But somehow I feel "becuase a,b and c." is correct.

Eg: Citizens of Country X die of heart diseases because they are lazy and they have defects in their genes. (Correct) (I know the sentence is wordy. couldn't think of a better example)

Citizens of Country X die of heart diseases because they are lazy and because they have defects in their genes. (Incorrect)

It would be nice if someone can confirm this.