Step 1: Understanding the sentence.
The sentence "One of my friends is an accomplished artist who recently held a solo exhibition at the local gallery." has an error in the phrase "my friend." Since the subject is "one of my friends," the word "friends" should be pluralized, making it "One of my friends is an accomplished artist..."
Step 2: Analyzing the options.
(A) my friend: Incorrect. "One of my friends" refers to one among a group, so it should be "my friends" in the plural form.
(B) who: This part is correct. "Who" properly introduces the relative clause.
(C) held a solo: This part is correct. "Held a solo" is grammatically accurate.
(D) at the: This part is correct. "At the" correctly introduces the location of the exhibition.
(E) No Error: This is incorrect because "my friend" should be corrected to "my friends."
Step 3: Conclusion.
The correct answer is (A) my friend, as it should be changed to "my friends" to match the plural subject "one of my friends."