Concept:This is a conditional sentence error. The second conditional requires "would" to match the hypothetical "were".
Explanation:Part (a) uses "If you were to", which sets up a hypothetical or unreal situation.
In English grammar, the second conditional form is: "If + subject + were + to + base verb, subject + would + base verb."
So, following "If you were to come", the main clause must use "would", not "will".
Part (c) says "it will be the best possible decision." This is incorrect because "will" expresses a real future possibility.
To show the imagined outcome of a hypothetical condition, we need "it would be".
Thus, part (c) contains the error. Parts (a) and (b) are correct.
The correct answer is therefore option (c).
Answer:Option (c)