B - it obviously wouldnt be c or d, and the middle class came into existence long enough ago that its unlikely to be a modern article
<span>Simply by use of the "mere exposure" effect, one's surroundings may shape their very outlook and world view. For example, someone who grew up in a positive homosexual household wouldn't think homosexuality was very strange at all. Yet, someone who has been taught that such a thing is wrong by all of their friends and loved ones would definitely lean more towards their way of thinking.</span>
Sentences a, b, c, each have a subject and a verb: that's a good sign that they might be sentences.
Sentence d in contrast does not have a subject. Who ansered the email? we don't know!
it's probably the speaker but it could be anyone
the correct answer is d!
Answer:
adaptations of animals and plants change from day to day with the weather
