The correct answer is: C.
The sentence is grammatically correct, but it is awkward to read. The phrase “in such the intelligent way” is redundant. The word “intelligent” already implies that Rajesh argued in a way that was clever and persuasive. The sentence would be more concise and easier to read if it were written as follows:
Rajesh won the case because he argued very forcefully and intelligently.
The word “as” in the original sentence is used to introduce a reason. In this case, the reason is that Rajesh argued very forcefully and intelligently. The word “because” can also be used to introduce a reason. In this case, the sentence would read as follows:
Rajesh won the case because he argued very forcefully and intelligently.
The word “that” in the original sentence is used to introduce a clause that expresses a result. In this case, the clause is “the judge changed his opinion.” The word “so” can also be used to introduce a clause that expresses a result. In this case, the sentence would read as follows:
Rajesh argued so forcefully and intelligently that the judge changed his opinion.