Verbal Ability - Spotting Errors - Discussion

Can we use, A lot of travel delay is caused due to the inefficiency and lack of good management "of the railways"?

Please someone clarify this.

"On behalf of " means that someone does it for someone else, or for a larger group that they are part of.
"On the part of'' and "on his/her/their part" means "by" or "from".

Consider:
"She\'s here to accept the reward on behalf of [for; in place of] her husband, who couldn\'t make it".
"On behalf of [speaking for everyone in] the organizing committee, we wish you an exciting evening".

"This plan should improve healthcare for everyone, but requires some sacrifices on the part of [by/from] the richest taxpayers".

"This is the result of a huge amount of work on her part [by her]".

Useful. Thanks everyone for solving.

I should suggest option A as in this spotting errors we have to find grammatical errors not change words inside the text.

So, The Correct answer: A lot of travel delay are caused.

It should be option A.

Is caused -> it's a passive form.

On the part is also correct but in my opinion, on the account or because of will be more suitable than on the part.

Use of behalf blames the entire staff of railway whereas the use of part blames only a part of the staff of the railway.

A lot of travel delay causes,

As it is a regular scene in Railways.

I think option A is also incorrect. I don't think due to and is caused can be used at a time. Quite same meaning.