Researchers have announced that the magnetic fields emitted by one manufacturer’s security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.

(a) of which type there are 200,000 worldwide, can interfere with pacemakers and that
(b) of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
(c) of which type there are 200,000 worldwide, they can interfere with pacemakers and
(d) 200,000 of which type exist worldwide, interfering with pacemakers, and
(e) 200,000 of that type existing worldwide and can interfere with pacemakers, and

(A) Of which type there are 200,000 worldwide, can interfere with pacemakers and that.

Explanation:

The correct answer to this question is option A as it best assists to reflect the intended meaning of the passage. The other options are either grammatically incorrect or implying an inappropriate claim. Option B inappropriately using the conjunction 'that' while option C wrongly employs pronoun 'they'. While option D implies an obscure meaning and option E employs 'and' improperly that disturbs the coordination of the sentence. Thus, option A seems the best fit for the passage that offers the most appropriate meaning to it.

each year on this day, i make it a point to listen to dr. martin luther king jr.’s great “i have a dream” speech. it’s electrifying every single time.

the content of dr. king’s speech, his inspiring presence, and the moment in history all came together to make the iconic “i have a dream” speech the defining moment of the american civil rights movement. but there are several other reasons why this speech, delivered over 50 years ago, remains an example of one of the best speeches in american history.

since part of my job is to people become better presenters, i’ve noticed several techniques that we can all learn from and be inspired by in this magnificent speech.

it’s anchored in a powerful related location

in most cases, you can’t handpick the spot to give a presentation, as mlk did for supreme symbolic effect when he stood on the steps of the lincoln memorial and echoed the opening words of the gettysburg address (“five score years ago . . ). but you absolutely can amplify your message by adapting it to your setting and location.

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.