Final answer:
The student likely investigated more physical properties than chemical properties of lead.
Step-by-step explanation:
The investigation focused on the properties of lead. Physical properties are characteristics that can be measured without changing the composition of a substance, such as mass, color, and volume. Chemical properties describe a substance's ability to react and form new substances. Since the investigation involved studying the properties of lead, it is likely that the student investigated both physical and chemical properties of lead. Therefore, option C is the most accurate choice as it suggests that the student investigated more physical properties than chemical properties of lead.