Q:

Every Open House we held since 2013 reaffirmed our belief that there is a need for human intervention to retain its trust and credibility over the age of anonymous communication.

(I)to retain trust and credibility in this age of
 (II)to retaining trust and credibility ageing
 (III)for retention of trust and credible age of

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