In the Following Proof, Which Justification Is Correct for Line

question 78

Multiple Choice

In the following proof, which justification is correct for line 4? $\begin{array}{llcc} \text {(1) \( (y) (\mathrm{S} y \supset \mathrm{G} y) \) } && \text {Premise } \\ \text { (2) \( \mathrm{Sb} \) } & \text {\(/(\exists x) \mathrm{G} x\) } & \text { Premise/Conclusion } \\ \text { (3) \( \mathrm{Sb} \Rightarrow \mathrm{Gb} \) } && \text {\(1 \mathrm{UI}\) } \\ \text { (4) \( \mathrm{Gb} \) } &\\\end{array}$

• A)2 QN
• B)2 Simp
• C)2, 3 MP
• D)Assumption
• E)None of these answers are correct.

---

Definitions:

Uncovered Interest Parity

A financial theory that suggests interest rate differentials between two countries will be equal to the expected change in exchange rates between their currencies.

Exchange Rate

The value of one currency for the purpose of conversion to another, which fluctuates based on market conditions and impacts international trade and investments.

British Pounds

The official currency of the United Kingdom, also known as GBP (Great Britain Pound).

Swiss Francs

The official currency of Switzerland and Liechtenstein, known for its strength and stability as a global finance indicator.