Explanation:

- Section 91 deals with evidence of the terms of contracts, grants, and other related documents. It states that when the terms of such documents have been reduced to writing, only the document itself can be used as evidence of its contents. This is often referred to as the "Best Evidence Rule".

- Section 92 adds to Section 91 by explaining that once the terms of a contract or grant are reduced to writing, no evidence can be given of the terms of the contract except the document itself, barring a few exceptions like fraud.

- Section 93 and Section 94 deal with the exclusion of oral evidence and the ambiguity in documents, respectively. They are more about how to interpret written documents when they are ambiguous.

- Correct Answer: Option 1, S.91