if you see last part of sentence [be made sufficiently safe in the future] "would" is past tense of "will" here will is needed to correctly refer to future

and regarding pronoun error that you are referring I think its correct in the actual reference "they" refers to power plants instead of journalists.

I hope I'm right if not plz correct me.

Cheers,
Satish.

y cant "they" refer to journalists.. can someone throw light on this

jeevan,

There are many threads regarding this particular question!

D definitely has a pronoun reference error as you said.

In E, 'would' and 'could', or 'will and 'can' can be used. Even though would/could is said to be in past tense, there are many places where we use it while referring to future things.

The main mistake with E is that it doesn't use 'be' after would - which is incorrect. { And you can't take the 'be' after 'could' to be common to both would and could }

So both are incorrect. But D is a better choice, as it just has ambiguity associated with it.

The main mistake with E is that it doesn't use 'be' after would - which is incorrect

Are you sure "would" should always have "be" after it when v are referring to future tense

I didn't say 'be' should always follow 'would' for future tense.

But 'would made' is wrong.

It should be 'would make', or 'would be made' or 'would have made'!!