Final answer:
Software testing accounts for 10-20% of software development costs.
Step-by-step explanation:
The correct answer is A. 10-20%
Software testing generally accounts for 10-20% of software development costs.
This includes the cost of planning and executing various testing activities such as unit testing, integration testing, system testing, and user acceptance testing.
For example, if the overall software development cost is $100,000, then the cost of software testing would be around $10,000 to $20,000.