Correct option is A
Active voice: The subject performs the action of the verb.
Passive voice: The subject receives the action of the verb.
The correct passive voice of the given sentence is (a).
Explanation:
· “They consider” becomes
It is considered in passive.
· The rest of the clause remains unchanged: “that India holds the key…”
· No need to change the tense inside the “that-clause” as it refers to a universal/general truth.
Structure:
· Active: They + consider + that-clause
· Passive: It is considered + that-clause
Example: People say that honesty is the best policy → It is said that honesty is the best policy.