Here are the correct causes and effects in the passage:
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Because a second person on the bike was heavier than he thought, he had to pedal harder. (Cause: the weight of the person on the bike; Effect: Alfonso had to pedal harder.)
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Alfonso hit a pothole, so Sandra screamed. (Cause: Alfonso hitting a pothole; Effect: Sandra screamed with delight.)
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Because it looked like they would crash, Sandra touched Alfonso’s hand. (Cause: the perception of an impending crash; Effect: Sandra placed her hand over his.)
The other two statements are not accurate representations of the causes and effects in the passage:
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Because Alfonso was not strong, he could not steady the bike. (This is incorrect; the passage suggests he was able to steady the bike eventually, even if it required effort.)
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The road was smooth, so he pedaled harder. (This is incorrect; there's no mention of a smooth road affecting how hard he pedaled.)