Questão número 640761

Consider the sentences below:

1. Global warming ___________ by the greenhouse effect.

2. When ice in the poles melt, sea levels ____________.

3. Carbon dioxide __________ the sun's heat.

4. An American scientist ___________ holes in the ozone layer.

Choose the alternative which presents the correct verb forms that complete the above sentences, respectively:

• A.

  causes / raises / trap / discovered

• B.

  is caused / rises / trap / discovered

• C.

  is caused / rise / traps / has discovered

• D.

  causes / raise / is trapped / discovered

• E.

  is caused / raise / traps / has discovered