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I don't think it is incorrect to use 2 possesives. But, here it doesn't make sensible sentence.
subjunctive mood: require (hypothetical situation--possibility) needs "be". D follows that.
some good info (webster commnet):
1.Miguel's and Cecilia's new cars are in the parking lot.
This means that each of them has at least one new car and that their ownership is a separate matter.
2.Miguel and Cecilia's new cars are in the parking lot.
This construction tells us that Miguel and Cecilia share ownership of these cars. The possessive (indicated by 's) belongs to the entire phrase, not just to Cecilia.
(E) is faulty in two respects. It includes the word 'to' twice; the second occurrence is redundant and should be omitted. Also, the use of double possessive adjectives ('diplomat's' and 'country's') is improper.
I didn't know how to interpret improper - whether its always incoorect or its incorrect here.