soverby

After reading the entire question, it is very clear that it is a conglomerate merger. In the original question at the top of the topic, it appeared that the Food unit purchased another food company, implying that there are several food units.
The actual problem specifically stated that the food company acquired is the first one of its industry, and hence would make it a conglomerate merger. If the Food company would acquire another food unit, it would then be considered a horizontal merger.