My father told me that all the labor and effort one put

M: +1.00/-0.00

In the given question, a part of the sentence is printed in bold. Below the sentence three alternatives to the bold part are given which may help improve the sentence. Choose the option that reflects the correct use of the phrase in the context of the sentence. In case the given sentence is correct, your answer is (E) i.e. No correction required.

My father told me that all the labor and effort one puts in to the professional front is meant to make life easier and therefore any professional success coming at the cost of personal happiness is pointless.
I. one puts at the professional front is meant to make life
II. one puts onto the professional front is meant to make life
III. one who puts into the professional front is meant to make life

[IBPS PO 2017 Prelims Q]

A Only I

B Only II

C Only III

D Both II and III

E No correction required