Rearrange the parts of the sentence in correct order.
India has already made
P-substantial concessions
Q-to enable a consensus
R-for the Paris pact

The given starting clause is "India has already made".
The transitive verb "made" requires a direct object. Part P ("substantial concessions") perfectly acts as the object: "India has already made substantial concessions..."

This is followed by the purpose of making these concessions, which is introduced by the infinitive phrase in part Q ("to enable a consensus").

Part R ("for the Paris pact") provides the closing prepositional phrase that modifies the consensus.

Thus, the logical and grammatically correct sequence is P-Q-R.