Which portfolio is better diversified, one that contains stock in a dental supply company and a candy

Question:

Which is better diversified, one that contains stock in a dental supply company and a candy company or one that contains stock in a dental supply company and a dairy product company?

Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...