Direction: Spot the grammatical errors in the given sentence. Mark the part with error as your answer. If there is no error, mark "No error" as the answer. (Ignore punctuation error)

The process was so simple (a)/ and easy to understand (b)/ that it hardly took (c)/ 5 minutes for us to learn it. (d)/ No error (e)

[SBI (PO), 2008]