In the Following Proof, Which Justification Is Correct for Line

question 121

Multiple Choice

In the following proof, which justification is correct for line 7? $\begin{array}{llcc} \text { (1) \( (\exists x) \mathrm{L} x \supset(x) (\mathrm{M} x \supset \mathrm{N} x) \) } && \text {Premise } \\ \text { (2) \( \mathrm{Lb} \cdot \mathrm{Mb} \) } & \text { \(/ \mathrm{Nb}\) } & \text { Premise/Conclusion }\\ \text { (3) \( \mathrm{Lb} \) } && \text { 2 simp }\\ \text { (4) \( (\exists x) \mathrm{L} x \) } && \text { \( 3 \mathrm{EG} \) }\\ \text { (5) \( (x) (\mathrm{M} x \supset \mathrm{N} x) \) } && \text { 1, \( 4 \mathrm{MP} \) }\\ \text { (6) \( \mathrm{Mb} D \mathrm{Nb} \) } && \text { \( 5 \mathrm{UI} \) }\\ \text { (7) \( \mathrm{Mb} \) } & \end{array}$

• A)2 Add
• B)3 DM
• C)6 Simp
• D)1, 5 MP
• E)None of these answers are correct.

---

Definitions:

Proteinaceous Infectious Particles

Also known as prions, these are misfolded proteins that can cause rare but fatal neurodegenerative diseases.

Degenerative Diseases

Conditions that involve the progressive loss of structure or function of neurons, including disorders like Alzheimer's disease, Parkinson's disease, and multiple sclerosis.

Nervous System

The complex network of nerve cells and fibers responsible for transmitting signals between different parts of the body.

Protein Capsid

The protein shell of a virus, which encloses its genetic material.