Which word can be used as both verb and noun?

Identify the underlined word or phrase (A, B, C, D) that must be changed for the sentence to be correct:

`They are planning on attending the convention next month in Kuala Lumpur, and so I am.

The manager expects all members of ____to do overtime whenever necessary.

Even though the former boss has always been rude with me, I do not hold any more___________ against him.

What is the noun of the word 'Beautify'?