In which sentence is the nonessential clause underlined? a) the man leaning against the wall is from the zoo. b) the snake that he is holding is not poisonous c) its coloring, which is brown and green, allows it to hide in marshy areas. d) that snake slithering behind the rock is actually harmless. in which sentence is the essential clause underlined a) eve's sister, who loves opera, took her to a performance. b) eve, holding her program, waited for the curtain to go up. c) the soprano, visiting from canada, had long black hair. d) the person who sells souvenirs is in the lobby.

The non-essential clause is underlined in sentence C. "Its coloring, which is brown and green, allows it to hide in marshy areas".  This clause is non-essential because it can be dropped without chaning the meaning of the sentence. The information it contains is not considered essential for the sentence to be complete.

Its coloring allows it to hide in marshy areas.

As you can see, the non-essential clause can be removed and the sentence still expresses a complete thought and the same meaning as the original sentence.

What is more, the essential clause is underlined in sentence D. "The person who sells souvenirs is in the lobby". In this case, the relative clause is essential because the information it contains is necessary to identify the person referred to in the sentence. This is not any person who is in the lobby but the one who sells souvenirs. If you remove the clause, the meaning of the sentence is changed.

The person is in the lobby.

The information contained by the relative clause is essential. And, as you can see, the clause is not between commas.

the answer will be the third choice

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