Answer:
B. depends on people's need
Step-by-step explanation:
The development of technology requires a huge amount of money for the researches. Historically, people who wanted to put capital on the research do it depending on the demand that exist in the market.
Example of this would be the development of mobile phone.
In the increasingly busier society in 1970s, people develop a need for a method of communication that they can use whenever they are. At that time, their most effective method of communication was land telephone (Which require you to be at your home or office). This was the reason why researches to develop a phone that did not require cables started to be made. Until eventually, a company called Motorola managed to mass produce the first type of mobile phone in 1973.