In the following question, a sentence/part of the sentence is printed in bold. Below are given alternatives to the bold sentence/part of the sentence at (a), (b) and (c) which may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is (d).
Ronald might fail the test, in which point he'd re-sit it next year.

• Ronald might fail the test, in which time he'd re-sit it next year.

• Ronald might failed the test, in which point he'd resit in next year.

• Ronald might fail the test, in which case he'd re-sit it next year.

• Ronald might fail the test, in which case he'd re-sit it next year.