Which sentence contains an error in punctuation pertaining to commas?
a) hesitantly, he opened the bright, squared-shaped package.
b) the rain fell in steady, repetitive, cycles throughout the night.
c) many visitors enjoy the cool, inviting atmosphere of the natural spring.
d) we hoped and prayed for a clearing as we hiked the long, treacherous path through the hills.

hint: look for excessive use of commas.

The corrrect answer is option b) "The rain fell in steady, repetitive, cycles throughout the night."

Explanation:

One of the common uses of commas in punctuation is to separate adjectives that describe a noun, this is called "coordinate adjectives". In this case, in option B we are separating coordinate adjectives that describes a rain cycle  (steady and repetitive) but word "cycle" is a noun, not an adjective. Therefore, a comma is not needed before the noun "cycle".

In the rest of the options, the comma is used to separate adjectives that describe nouns so they are correct:

a) bright, squared-shaped package

c) cool, inviting atmosphere

d)  long, treacherous path

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the eye wink at the hand; yet let that be / which the eye fears, when it is done, to see.