Answer:
c. threat from the environment
Step-by-step explanation:
Strategic window is a brief period in a business period when unit takes advantage of some opportunity created in the market by following some strategy . It remains for a brief period.
Leveraged situation arises when a business unit has to borrow heavily for its business activity due to internal resource crunch.
Threat from environment arises when a company fails to upgrade itself vis a vis its competitors in accordance with the demands of the market . The given scenario belongs to this category.