In each of the questions given below four words are given in bold. These four words may or may not be in their correct position. The sentence is then followed by options with the correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct. Find the correct combination of the words that should interchange. If the sentence is correct as it is then, select option “No interchange required” as your choice.

After having (A) the stress seemed (B) on a president, witnessing (C) access to a personal chef placed (D) to be the best perk of the job.

To determine the correct interchange of words, let us analyze the context and grammatical structure of the sentence:

Original sentence: "After having (A) the stress seemed (B) on a president, witnessing (C) access to a personal chef placed (D) to be the best perk of the job."

1. In the first clause, "After having the stress seemed on a president", the structure is grammatically incorrect. The verb "seemed" does not collocate with the prepositional phrase "on a president". Instead, stress is typically "placed" on someone. If we substitute placed (D) for seemed (B), we get "the stress placed on a president", which is grammatically correct.
2. In the opening phrase, "After having the stress...", it makes more contextual sense to observe or experience the stress. Swapping having (A) with witnessing (C) gives us: "After witnessing the stress...", which fits the context perfectly.
3. Applying these interchanges to the second part of the sentence, "...witnessing access to a personal chef placed to be the best perk of the job" becomes "...having access to a personal chef seemed to be the best perk of the job." Here, "having access to" is a standard idiomatic phrase, and "seemed to be" correctly links the subject to the predicate adjective phrase.

By interchanging A with C and B with D, the sentence becomes grammatically correct and contextually meaningful:
"After witnessing (C) the stress placed (D) on a president, having (A) access to a personal chef seemed (B) to be the best perk of the job."

Therefore, the correct option is A-C & B-D.