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Who....cũng đúng thôi -theo văn nói, vì DID đã theo Emma + TELEPHONE ? thành cấu trúc câu hỏi rồi.

Trong thực tế bạn hỏi Whom did Emma telephone ? thì rất đúng văn phạm ( văn viết ) nhưng nghe như một..cô thầy văn phạm tiếng Anh đang hỏi học trò vậy đó (!) nên ở trong một tình huống nào đó, câu văn nghe hơi bị..cứng- trịnh trọng- giống như..khôi hài nữa cũng không chừng ! Nhưng khi viết bạn cứ dùng WHOM cho văn bản mang tính nghiêm túc, không ai bắt bẽ được !

"Whom" Less CommonThe form "whom" is becoming less and less common in English. Many native English speakers think "whom" sounds outdated or strange. This trend is particularly common in the United States. Especially when combined with prepositions, most people prefer to use "who" as the object pronoun. To most native English speakers, the examples below sound quite natural.

Examples:

Who did you come to the party with?I don't know who he gave the book to.That is the woman who I was talking to.Who did you get that from?Do you have any idea who he sold his car to?That is the person who I got the information from.

Source: http://www.englishpage.com/minitutorials/who_whom.html

Don't Get it? Use Who

If you are unsure which to use, use who. Firstly, it is much more common thanwhom. Secondly, the use of whom is considered by many to be on its last legs in English. (Of course, Grammar Monster does not condone this practice, but if you don't have time to learn the difference, this advice will do for now. Of note, the pairings you/you and it/it make no distinction between being the subject of a verb or not, and who looks like it's heading in that direction too.)

Example:

Who are you going to believe, me or your own eyes?  (Groucho Marx quote)(This quote by Groucho Marx is incorrect. It should start Whom are you going to believe. However, as whom sounds a bit contrived, we'll let Groucho off this time.)

Source:http://www.grammar-monster.com/lessons/who_whom.htm