The problem you're working on is related to membrane macroscopic properties derived from multiscale modeling of red blood cell mechanics and blood flow. Let's break it down step by step.

The given formula for $\mu_0$, a membrane property, is:

$\mu_0 = \frac{\sqrt{3} k_B T}{4p l_m^0} \left( \frac{1}{x_0 (2l - x_0)^2} - \frac{1}{4(l_0 - x_0)^2} + \frac{1}{4} \right) + \frac{\sqrt{3} k_p (n + 1)}{4 \left( A_{l_m}^{n+1} \right)}$

Where certain assumptions and conditions are given:

• $x_0 = 1/2$
• $k_p = 0$

Now, the question asks which of the following statements are true under these conditions:

1. Viewing $\mu_0$ as a function of $T$, we can say that $\mu_0$ is proportional to $T$.
2. The graph of $\mu_0$ as a function of $T$ is linear.
3. The graph of $\mu_0$ as a function of $T$ has a slope of $\frac{\sqrt{3} k_B}{2p l_m}$.

Let's analyze the statements:

• From the given formula, it's clear that $\mu_0$ has a $T$-dependence through the term $\frac{\sqrt{3} k_B T}{4p l_m^0}$. This means that $\mu_0$ is directly proportional to $T$. So, statement (i) is true.

• Since $\mu_0$ depends linearly on $T$ (with no higher powers of $T$ appearing in the expression), statement (ii) is also true.

• Statement (iii) gives a specific slope of $\mu_0$ as a function of $T$, and this can be verified by isolating the $T$-dependent term. The term $\frac{\sqrt{3} k_B}{2 p l_m}$ indeed corresponds to the coefficient in front of $T$, so statement (iii) is true.

Conclusion:

All three statements are correct, so the correct answer would be (G) all of them, which you had marked.

However, you received a partial score, so there may be an issue in how the answer was processed. Based on the analysis, your logic seems sound.

Would you like further clarification on any part of the explanation?

Here are 5 related questions to consider:

1. How does the assumption $k_p = 0$ simplify the overall expression for $\mu_0$?
2. What is the physical meaning of $\mu_0$ being proportional to temperature $T$ in the context of membrane elasticity?
3. Can $\mu_0$ ever become nonlinear in $T$ if other variables are adjusted?
4. How do different values of $x_0$ affect the behavior of the membrane elasticity equation?
5. What happens to the system if $k_p$ is nonzero?

Tip: When solving complex mathematical models, it's always good to check your work by considering the dimensions or units of each term. This can help verify if your assumptions and calculations align correctly with physical reality.