jim441 wrote:
Why A is wrong and E is right?
Here's (A).
(A) Bypass surgery is riskier than all alternative therapies.Notice that the passage doesn't say that "all" alternative therapies are less risky than bypass surgery. Rather, the passage mentions "certain therapies" and then says, "these other therapies pose less risk to the patient."
So, in saying "bypass surgery is riskier than
all alternative therapies," choice (A) goes beyond what the passage supports.
Here's (E).
(E) Sometimes there are equally effective alternatives to bypass surgery that involve less risk.Let's break this choice down and see how it matches up with the passage.
Sometimes - This is supported by the last sentence of the passage, "Bypass surgery is especially debatable for single-vessel disease." That sentence indicates that bypass surgery is more debatable in some cases than in others. So, it implies that "sometimes" bypass surgery makes more sense.
Also, the passage doesn't say that bypass surgery is never more effective. Rather, it says, "Coronary bypass surgery is commonly performed on patients suffering from coronary artery disease
when certain other therapies would be as effective," indicating that, at some times "when certain other therapies would be effective," bypass surgery is performed. So, "sometimes" matches OK with what the passage says.
there are equally effective alternatives to bypass surgery - This part of the choice is supported by "certain other therapies would be as effective," in the passage.
that involve less risk - This part of the choice is supported by "these other therapies pose less risk to the patient," in the passage.
The correct answer is (E).
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Marty Murray | Chief Curriculum and Content Architect
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