Direction: Which of the following phrases (I), (II), and (III) given below each sentence should replace the phrase printed in bold letters to make the sentence grammatically correct? Choose the best option among the five given alternatives that reflect the correct use of phrase in the context of the grammatically correct sentence. If the sentence is correct as it is, mark (e) i.e., "No correction required" as the answer.

Q:

The “Hermit Kingdom” is increasingly isolating itself because of its nuclear ambition that threatens its neighbourhood and the world at large.

(I) isolated because of
(II) isolating themselves because of
(III) isolated themselves because of their

• 1
  Only (I) is correct
• 2
  Only (II) is correct
• 3
  Only (III) is correct
• 4
  Both (I) and (II) are correct
• 5
  No correction required