You need a colon and period in your sentence.
Not sure which word is bolded, but I can still help you out. There are two pronouns in this sentence: we and us.
If we is bolded, the answer is C. nominative case. These pronouns are often the subject of a sentence.
If us is bolded, the answer is A. objective case. The object of a sentence receives the verbs attention. In this sentence, you ask "What is surrounded?" to understand that us is objective case.
Just so you know, possessive case is when the pronoun owns something. For we, the possessive pronoun is our. We went home to our house.
Your answer is: A) Purchasing power
In order to spend money, you need purchasing power. Purchasing power means someone can purchase something like a product or service. Having confidence doesn't mean you can buy something. Well, having confidence is helpful when to comes to buying, but that doesn't make it legal for you. Less disposable income will lead to purchasing power. you need to give something up in order to get something. That's the way it works.
Best Of Luck,

Differences between the following:
Belief = refers to something that a person believes as reality based on his own conviction.
Hypothesis = is also known as an educated guess based only on observation.
Laws = it refers to the body of observations. Scientific laws explain things.
Theories = It summarize a hypothesis, it is valid as long as there's no evidence to prove that this is not valid.