Concept:The disc plough supports its discs through a vertical metal part called the standard.
Explanation:Discs are not fixed directly to the beam or the frame.
Each disc is attached to a strong vertical member known as the standard.
The standard holds the disc bearing firmly and allows the disc to rotate while cutting the soil.
The beam is the main frame that carries all the parts.
The scraper cleans soil from the disc surface.
The furrow wheel helps balance the plough in the furrow.
Therefore, the part to which discs are connected is the standard.
Answer:B. standard