Quote:
The natural disaster was of such devastating magnitude that the country had no choice but to accept help from many other countries, including those with which they had less than friendly relations.
B. including those with which it had less than friendly relations
E. even from those countries that it has less friendly relations with
i chose E because i heard that correct idiom is relations with then why it is not mentioned in option B ?
"Relations with" is the correct idiom, but depending on the context, the preposition does not need to be placed immediately after the noun.
When writers want to avoid ending a sentence/phrase with a preposition, they can use the construction "preposition + which."
End of the sentence: The country was forced to accept help from other countries that it had less than friendly relations
with.
Can be rewritten as:
Preposition + which: The country was forced to accept help from other countries
with which it had less than friendly relations.