Question

in recent decades, the efficiency of the United Nations by growing number of countries
( a) would be questioned
( b) will have been questioned
( c) had been questioned
( d) has been questioned​

Answer 1

Answer:

I think answer is (b) I think soo mate

Answer 2

Answer:

In recent decades, the efficiency of the United Nations has been questioned​ by growing number of countries.

Explanation:

As per this question, we are going to find the correct answer by eliminating the options:

Since, the sentence is taking about present perfect tense, so we will select the options accordingly:

• would be questioned: is taking about the future, so it is not correct.
• will have been questioned: is taking about the future, so it is not correct.
• had been questioned: is taking about the past, so it is not correct.
• has been questioned​: This is coorect as it is in present perfect tense.

So, the answer is:

In recent decades, the efficiency of the United Nations has been questioned​ by growing number of countries.

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