<p>A: The couple to whom Sheila agreed to sell the house did not offer the higest price but did treat her with the greatest respect</p>
<p>B: The couple who Sheila agreed to sell the house to did not offer the higest price but did treat her with the greatest respect</p>
<p>C: The couple, Sheila agreed to sell the house to them, did not offer the highest price but did treat her with the greatest respect</p>
<p>D: The couple to whom Sheila agreed to sell the house did not offer the highest price but did treat her with the greatest respect</p>
<p>E: The couple that Sheila agreed to sell the house to offered not the highest price but did treat her with the greatest respect</p>
<p>Thanks! And an explanation would really help. THanks!</p>