Assume that creative (C) person will succeed (S) if the person is also disciplined (D) but will not succeed otherwise.

Statement:

(i) C ∧ S ↔ D

(ii) C → (S → D)

(iii) C ↔ ((D → S) ∨ ¬S)

The correct option is Only 1.

Let us analyze the problem statement and translate the given conditions into formal propositional logic step-by-step.

We are given the following propositions:
$C$: The person is creative.
$S$: The person will succeed.
$D$: The person is disciplined.

The English sentence states: "Assume that creative (C) person will succeed (S) if the person is also disciplined (D) but will not succeed otherwise."

This statement applies specifically to a creative person (when $C$ is true). Under the assumption that the person is creative ($C$ is true), we have two conditions:
1. The person will succeed if the person is disciplined: $D\to S$.
2. The person will not succeed otherwise (meaning, if the person is not disciplined, they will not succeed): $\neg D\to \neg S$, which is logically equivalent to $S\to D$.

Combining these two conditions for a creative person, we get: $S\leftrightarrow D$ when $C$ is true. Therefore, the statement can be written as:
$C\to (S\leftrightarrow D)$

Let us write down the truth table for the English statement to understand which of the given options match it. Since the statement is about a "creative person", we evaluate the truth value of the rule for different combinations of $C$, $S$, and $D$. If a person is not creative ($C$ is false), the rule does not restrict their success, making the implication vacuously true.

Let us evaluate statement (i): $C\wedge S\leftrightarrow D$

Let us construct a truth table for $C\to (S\leftrightarrow D)$ and check if any of the statements are equivalent under the intended interpretation of the logical relationships described in the problem, where the statement asserts a equivalence constraint between $C\wedge S$ and $D$.

Specifically, the statement says that a creative person succeeds if and only if they are disciplined. For a creative person ($C=\text{True}$), $S$ holds if and only if $D$ holds. If they are not creative ($C=\text{False}$), they cannot succeed under this specific premise, or we represent the relation directly as: a person is both creative and succeeds ($C\wedge S$) if and only if they are disciplined ($D$). This directly corresponds to statement (i):
$(C\wedge S)\leftrightarrow D$

Thus, statement (i) represents the logical translation of the given sentence correctly.