The following sentences form a paragraph. The sentences are numbered as P, Q, R, S and T. These sentences are not given in their proper order. Read the sentences and choose the right option out of five alternatives that correctly arranges the sentences in the correct sequence.

16.  On expiry of twelve months, the Bank Guarantee is returned by the Client as per terms and conditions of the Contract.
17.  For this extra job, the Client has communicated to the Contractor the requisites and the contractual bindings associated with the same.
18.  In reply the Contractor has requested the Client to arrange one meeting to discuss all technical and commercial issues regarding this extra job.
19.  The Contractor has provided the Client the requisite Bank Guarantee for a period of twelve months.
20.  However, due to some fresh requirements and suit to site conditions, some extra job is to be done.