[Idiom] "for the fear that... ? (concerning some "the" issues) "

[infiniteone]

A: There's something odd about eating excessive amounts of seafood for fear that creatures will be killed at sea.

B: There's something odd about eating excessive amounts of seafood for fear that the creatures will be killed at sea.

C: There's something odd about eating excessive amounts of seafood for the fear that creatures will be killed at sea.

"B" is the(Should I put 'the' on this part?) original version.

Comparing to B, What is the(Should I put 'the' on this part?) diffrences among the sentences ?

I have a lot of difficulty understading the (Should I put 'the' on this part?)usage of 'the'.

Sorry to bother you with "(Should I put 'the' on this part?)" questions.

Can you help me?

 

[Raymott]

A: There's something odd about eating excessive amounts of seafood for fear that creatures will be killed at sea.

B: There's something odd about eating excessive amounts of seafood for fear that the creatures will be killed at sea.

C: There's something odd about eating excessive amounts of seafood for the fear that creatures will be killed at sea.

"B" is the(Should I put 'the' on this part?) original version.

Comparing to B, What is the(Should I put 'the' on this part?) diffrences among the sentences ?

I have a lot of difficulty understading the (Should I put 'the' on this part?)usage of 'the'.

Sorry to bother you with "(Should I put 'the' on this part?)" questions.

Can you help me?

There's something odd about all three sentences.
It's very unlikely that anyone would eat a lot of seafood for fear that the creatures are being killed. One would be more likely to avoid seafood for fear that the creatures are being killed.

Even so, you could say:
There's something odd about avoiding seafood for fear thatthe creatures will be killed at sea.

Anyhow: you need " ... for fear that the creatures ... ".
"for fear that" is idiomatic. And you use "the creatures" because you've referred to them already as 'seafood'.