Which sentence has a gerund or gerund phrase that functions as the subject of the sentence?

a) i appreciate your offering me an opportunity to travel to europe
b) are you worried about begin in charge of the game
c) lying to cover up a mistake is unwise and dishonest

C) lying to cover up a mistake is unwise and dishonest

Explanation:

Gerund is a word ending in -ing that is made from a verb. For example, the gerund form of the verb 'to look' is looking. Gerund always functions as a noun.

Gerund phrases are phrases that start with a gerund. Both gerund forms and gerund phrases can function as a subject or an object (direct/indirect) in a sentence.

In the last sentence, 'lying' is gerund, while 'lying to cover up a mistake' is a gerund phrase that functions as a subject.

its hard for me to see which word is supposed to be in bold. if i knew then i would be able to better.

may i see the passage?