Why does the taxable acquisition of an S corporation give rise to incremental tax benefits from stepping

Question:

Why does the taxable acquisition of an S give rise to incremental tax benefits from stepping up the target’s assets while the acquisition of a freestanding C does not?
Corporation
A Corporation is a legal form of business that is separate from its owner. In other words, a corporation is a business or organization formed by a group of people, and its right and liabilities separate from those of the individuals involved. It may...