Answer:
problem child
Step-by-step explanation:
A problem child is a business-related term that is used to describe a situation in which there is a form of low market share but in an increasing and quick thriving enterprise or industry at large.
Hence, in this situation, the correct answer is a PROBLEM CHILD.
Given that when an SBU has become a PROBLEM CHILD, it is essential to either invest in it heavily to gain better market share, acquire competitors to get the necessary market share, reposition its products, or drop it.