Which of the following inventions of the 1950s made other inventions possible?

the automobile
the transistor
the television
the hearing aid

answer if you know for sure only .

Correct the transistor

John Bardeen, Walter Brattain, and William Shockley were awarded the Nobel Prize in Physics in 1956 for the invention of the transistor. (It might be noted, however, that there was some friction between Schockley and the other two members of the Bell Labs' team, Brattain and Bardeen.) A 2007 article in Computerworld magazine calls the transistor "the single most important invention of the 20th century." In addition to its early uses, making transistor radios and car radios possible, transistors have become the key component to all types of electronic devices. The transistor also functioned as "the building block for the processor," according to Computerworld.

As for the other inventions mentioned ...

Automobiles were invented in the 1880s.

The first electric hearing aid, called an Akouphone, was introduced in 1898.

The first demonstration of television technology occurred in 1927.

letter d is correct.

the answer is a. since they were a huge producer of cotton and wanted the most money for it.