(1) Take a First Glance (5 seconds)
The became vs. have become split indicates that this question may be testing Verbs. Look for time markers that indicate the correct tense.
(2) Read for Meaning
The core sentence reads: Ever since the risks became known, parents have elected to … . Became and have become are both acceptable in this sentence—either one can logically describe when the continuing time period indicated by ever since began. For example, ever since she has been working out… and ever since she started working out… are both valid constructions.
The verb that follows the comma, however, needs to be in the present perfect tense. The time marker ever since requires the present perfect tense have elected in order to indicate that the parents began to enroll their kids in tennis and soccer in the past and are still continuing to do so today. You’re locked into ever since, so eliminate any answers that use the simple past elected.
The original sentence says sports that were less dangerous. The past tense were illogically implies that tennis and soccer used to be, but no longer are, less dangerous than football. If these sports were now as dangerous as football, then it wouldn’t make sense for the sentence to say that parents continue to choose them instead of football. Eliminate answer choice (A) and any others that repeat this mistake.
(3) Find a Starting Point
Start with any difference that seems easiest to you, then move to the next easiest issue, and so on. Stop when you have one answer or you aren’t sure how to address the remaining differences. All errors for each choice are detailed in the next section.
(4) Eliminate (and Repeat)
(A) The past tense were illogically implies that tennis and soccer used to be, but no longer are, less dangerous than football.
(B) CORRECT. The present perfect have elected matches the time marker ever since. Sign their children up and sign up their children are both correct idioms; that split is a red herring. This choice also removes the past-tense verb were found in the original sentence; the wording less dangerous sports correctly indicates that soccer and tennis were and still are less dangerous than tackle football. The word including appears to introduce a comma –ing structure, but comma-including is an exception to the usual rule. This construction is used to introduce examples of the item mentioned before the comma (in this case, sports).
(C) The time marker ever since requires the present perfect tense have elected in order to indicate that parents began enrolling their children in less dangerous sports in the past and continue to do so today. It is incorrect to say ever since something happened, people did something else.
(D) The past tense were illogically implies that tennis and soccer used to be, but no longer are, less dangerous than football.
(E) The time marker ever since requires the present perfect tense have elected in order to indicate that parents began enrolling their children in less dangerous sports in the past and continue to do so today. It is incorrect to say ever since something happened, people did something else.