A gerund is a verbal that looks like a verb + -ing, and functions as a noun in a sentence. So, having this in mind, the correct answer as to what the gerund is in this sentence is C. speeding.
Answer:
Several <u><em>building</em></u> surrounding the Willis (should be buildings)
Tower have equally attractive interiors. They
offer beautiful views of the city <u><em>to.</em></u> However, (should be too)
the Willis Tower is the best choice for any
company. <u><em>Weather</em></u> the idea of a view is (should be Whether)
appealing or not, <u><em>customer's</em></u> will be (should be customers)
impressed by the <u><em>buildings</em></u> size. (should be building's)
DONE
Explanation:
Add -'s <em>apostrophe s </em>to make a noun possessive. Normally, plural nouns are by adding s. No apostrophe! Some nouns have irregular plural forms, like man > men, child> children, woman> women, ox> oxen, deer> deer.
