Which sentence contains a dangling modifier?
a. while i was watching my favorite tv show, the telephone rang.
b. after studying late at night, latise felt tired the next morning.
c. whistling a happy tune, marti walked slowly to school.
d. while playing my electric guitar, the amplifier went dead.

d. While playing my electric guitar, the amplifier went dead.

Explanation:

A modifier is a word, phrase or clause modifying, describing or adding more information about nouns, verbs, adverbs or adjectives (meaning that a modifier is either an adjective or an adverb). Now, a dangling modifier is a modifier whose object is not clearly stated in the sentence, and therefore, it is an error that makes the sentence confusing or ambiguous.

In option D, “While playing my electric guitar” is the modifier (It is modifying the following clause), but this modifier is dangling because its object (that is, the one playing the electric guitar) is not clearly stated in the clause “the amplifier went dead.” This clause, instead, wrongly suggests that the amplifier was playing the guitar, which makes the sentence wrong. A correct version of the sentence is as follows “While I was playing my electric guitar, the amplifier went dead.”

i would have to say "a" or "d".