Explanation
Correct answer: B.
Choice B is the best answer. "For example" logically signals that this sentence—noting Singletary’s work with Jody Naranjo—provides an example supporting the previous point about Singletary’s collaborations with other artists.
Why the other choices are wrong
Choice A
Choice A is incorrect because "in conclusion" illogically signals that the information in this sentence concludes or summarizes the previous point about Singletary’s collaborations with other artists. Instead, it provides an example in support of that point.
Choice C
Choice C is incorrect because "however" illogically signals that the information in this sentence contrasts with the previous point about Singletary’s collaborations with other artists. Instead, it provides an example in support of that point.
Choice D
Choice D is incorrect because "in comparison" illogically signals that the information in this sentence is being compared to the previous point about Singletary’s collaborations with other artists. Instead, it provides an example in support of that point.