B. provide supporting evidence.
C. summarize information.
D. avoid plagiarism.
B.) Carla skates before school in the morning.
C.) Our hockey team won the league championship.
D.) Jenna chose Hector as her skating partner.
adding wood to a burning fire to increase the heat
not eating anymore when you're full
The correct answer is the first one: Steel structures are now stronger than at any other time.
This is the only sentence that makes a good comparison between structures from different times. It compares structures from today and structures from the past. The word "at" is used to express the time when an event takes place so it clarifies that we are talking of the structures from another time period.
The other options fail on comparing structures from different times as they don't use "at", they compare the structures to time itself: "stronger than any time." Here the sentence states that steel structures are stronger than time wich doesn't make any sense.
definition and explanation structure
dangling construction
other misplaced modifiers
unparallel structure