IMO E.

Subjunctive mood is proper only in C/E.

A - mandate that X, Y are allowed - wrong
B - mandate that X would be - wrong
D - mandating that - modifies the entire preceding clause and gives awkward meaning.

Between C/E
C - which refers to the four freedoms and again the right of free movement seems redundant.

E is more clear and concise.

OA is E

What helps us identify this question as a Subjunctive question as well as identify the mistake is the following Stop Sign:propose/recommend/require/request/insist/suggest/mandate/ask/demand thatWhenever you come across this Stop Sign, make sure that the following verb is in its base form.

Kartik is right. The words act as sign posts when a sentence is in the subjunctive mood.


In recent years, the European Union has been advocating the addition of the Freedom of Knowledge to its laws alongside the existing Four Freedoms, which mandate that goods, persons, services and capital are allowed to move freely within the Union's boundaries.

which mandate that goods, persons, services and capital are allowed to move freely
which mandate that the right of free movement would be granted to goods, persons, services and capital
which mandate that the right of free movement be granted to goods, persons, services and capital that are
mandating that goods, persons, services and capital should move freely
which mandate that goods, persons, services and capital be allowed to move freely



Just observe carefully, there are two clauses in the sentence. The second sentence has the verb mandate which is in its base form and also the subjunctive is most suited in the above sentence as it is kind of an order given by the EU or the government hence the use of "BE".

Hope this helps for recognising the subjunctive.......