Multiple choice

Home owners who insulate their walls and windows properly can substantially reduce their homes' power bills, since improper insulation can waste upto ten percent of electricity.

  1. Home owners who insulate their walls and windows properly can substantially reduce their homes' power bills, since improper insulation can waste upto ten percent of power.

  2. Because improper insulation can waste upto ten percent of electricity of a home through heat loss, home owners can substantially reduce their homes' power bills by properly insulating walls and windows of their homes.

  3. Their homes' electricity bills are substantially reduced by home owners by proper insulation of walls and windows which, when improperly insulated, can waste upto ten percent electricity.

  4. The proper insulation of walls and windows by the home owners, due to the fact that improper insulation can waste upto ten percent of a home's energy by increase in heat loss, can reduce the power bills of homes.
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B Correct answer
Explanation

Correct. The option corrects the error of misplaced modifier and the missing antecedent by rearranging the modifying clauses.

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