Answer:
The solution, I think, is to try our best and see what happens.
Step-by-step explanation:
A comma is a slight pause in any given sentence that allows a reader to take a break though for only a short time. It is also used in many ways, including the separation of two or more independent clauses in a sentence.
The five rules of using a comma are that it must be used after an introductory phrase/ clause, after a parenthetical phrase or clause, to separate two independent clauses that are joined by a coordinating conjunction, to separate items in a list, and before any quotations.
Therefore, the clause "I think" in the given sentence will be put in between commas. Thus, the correct sentence will be "The solution, I think, is to try our best and see what happens."