Step 1: Identify the principles.
The firm had committed to two guiding principles:
1. Avoid unethical practices.
2. Share earnings equally.
Step 2: Assess whether the project violates principle (a).
The project was awarded not because of favoritism or nepotism but after a fair presentation. Although Rahman’s father referred the firm, the award was based on merit (presentation quality). Hence, it does not amount to unethical practice. Thus, principle (a) is not violated.
Step 3: Assess principle (b) regarding equal sharing.
Rahman’s referral helped secure the opportunity, but the team had already agreed to share all earnings equally. Granting Rahman an extra finder’s fee would violate this principle. Therefore, to remain consistent with their agreement, Rahman should not get special compensation.
Step 4: Evaluate options.
(A) Incorrect — It assumes both principles are violated, which is not true.
(B) Incorrect — The first principle (ethics) is not violated since selection was based on merit.
(C) Correct — Take up the project, but earnings should be shared equally without extra reward to Rahman.
(D) Incorrect — Giving Rahman a finder’s fee violates equal-sharing principle.
(E) Incorrect — Suggesting a finder’s fee with adjustments is unnecessary and complicates fairness.
Step 5: Conclusion.
The most appropriate choice aligns with fairness and principles: accept the project, but share equally without giving Rahman any finder’s fee.
Final Answer:
\[
\boxed{\text{C. They should take up the project, and Rahman is not entitled to finder’s fee.}}
\]