Question

passage
the computer \mouse\ was invented in the mid - 1960s by douglas engelbart. engelbarts original mouse was housed in a wooden box that had three buttons on top and two wheels on its underside, but the principle was the same as that of the modern mouse. unfortunately for engelbarts bank account, demand for the mouse did not become widespread until the launch of the apple macintosh personal computer in 1984—by which time engelbarts patent had expired.
question
the passage suggests that douglas engelbart
○ made relatively little money from his invention
○ worked with apple computers in the 1980s
○ was not granted the proper patent for his work
○ called the mouse by a different name

Explanation:

The passage states that demand for the mouse didn't become widespread until 1984 when Engelbart's patent had expired. This implies he couldn't profit much from the later - widespread use of his invention. There is no mention of him working with Apple (only that Apple's computer launch led to mouse popularity), he did have a patent (it just expired), and there's no indication he called the mouse a different name.

Answer:

made relatively little money from his invention