The correct answer is: A. Antiquarian.
An antiquarian is a person who collects, studies, and sells old things. They are often experts in a particular field of antiques, such as furniture, jewelry, or art. Antiquarians may work in a shop or online, and they may also offer appraisal services.
A junk-dealer is a person who buys and sells used goods, often of low value. Junk-dealers may operate out of a shop or a stall at a market. They may also buy goods from people’s homes.
A crank is a person who holds extreme or eccentric views. Cranks are often considered to be crazy or foolish.
An archaeologist is a person who studies human history through the excavation of sites and the analysis of artifacts. Archaeologists may work in a variety of settings, including museums, universities, and government agencies. They may also be involved in the preservation and conservation of archaeological sites.