Adjective is used to describe “noun or pronoun”. Therefore, in the above case, it can be concluded that “who” is word that was wrongly placed in connecting that sentence.
This sentence formation of with Dr. Jones and all of the patients like plays the paino well. “Who” represents a question symbol in the above case, which is an inappropriate word to use.
Thus, the options (d), (b) and (c) are incorrect.
This sentence formation of with Dr. Jones and all of the patients like plays the paino well. “Who” represents a question symbol in the above case, which is an inappropriate word to use.
Therefore, the correct option is – a. who.