Everyone in my family is participating because reducing our environmental impact is important . Which group of words is a gerund phrase?

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

the answer is   c the cold war

? ? what can you explain this to me i am so confused