Multiple choice

Directions: Choose the option which is grammatically correct and the best version of the underlined part of the sentence.

Ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides reacting with sunlight.

  1. from hydrocarbons and nitrogen oxides reacting with sunlight.

  2. when hydrocarbons and nitrogen oxides react with sunlight.

  3. as hydrocarbons and nitrogen oxides receive sunlight.

  4. by the reaction of hydrocarbons and nitrogen oxides in the sunlight.

  5. when hydrocarbons and nitrogen oxides start reacting with sunlight.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct; the phrase has been changed into a clause which explains the time of the formation of ozone.

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