Final answer:
Luiza's paragraph is an objective summary as it concisely and without bias recounts the main points of Neil MacGregor's work on the Sudanese Slit Drum.
Step-by-step explanation:
Luiza's paragraph about the Sudanese Slit Drum can best be described as an objective summary. This is because it succinctly recounts the contents and main points of Neil MacGregor's trace of the origins of the slit drum in relation to the Sudanese struggle for independence without providing personal commentary or opinions. An objective summary aims to briefly restate the central ideas of a source text without bias, which is what Luiza appears to be doing in her paragraph.