Final answer:
The launch of fully assembled personal computers and the development of the microprocessor made personal computers more attractive to businesses, due to increased accessibility, reduced size, and the introduction of a user-friendly graphical user interface.
Step-by-step explanation:
The two significant developments that made personal computers more attractive to businesses in the late 1970s and early 1980s were the advent of fully assembled personal computers and the invention of the microprocessor. Computer manufacturers like Apple, Commodore, and Tandy began offering fully assembled computers, which made them more accessible than the complex, expensive kits that were previously available.
Simultaneously, the invention of the microprocessor dramatically reduced the size and cost of computers, allowing manufacturers like Apple to target a broader market, including businesses, with personal computers that could fit on a desk. By 1981, IBM entered the market with their IBM personal computer, solidifying the personal computer's role in business. Moreover, the introduction of the Macintosh in 1984 brought a user-friendly graphical user interface, further popularizing personal computers for business use.