Question

select the misplaced or dangling modifier.
the eight-track tape, a popular audio format in the 1970s, offered a convenient way for people to play music recordings in their cars, both portable and affordable.
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Explanation:

The phrase "both portable and affordable" is intended to describe the eight-track tape, but its placement at the end of the sentence incorrectly modifies the closest noun phrase "their cars" instead, making it a misplaced modifier.

Answer:

both portable and affordable