Step 1 (Interpret the stem).
The statement compares assumptions to ingredients and says: the adequacy of the assumptions can only be judged by the final outcome—just like ingredients are validated by the finished dish. Thus, the criterion of truth/adequacy is {performance of the end product}.
Step 2 (Test options against this idea).
(A) Talks about reputation/quality not needing promotion—not about validating inputs by outcome.
(B) Concerns heredity/similarity—irrelevant to result-based validation.
(C) “All is well that ends well” focuses on a good ending excusing prior issues; it doesn’t claim that inputs are {tested by} the outcome—close but not precise.
(D) “As you sow, so shall you reap” is causal/moral reciprocity, not evaluation of adequacy by final performance.
(E) “The proof of the pudding is in the eating” states that only the result (eating) establishes the pudding’s quality, which mirrors “only the final product dictates whether the ingredients suffice.” - Exact parallel.
\[
\boxed{\text{Correct Answer: (E) The proof of the pudding is in the eating!}}
\]