A. that facial pores, if covered much of the time with masks, cosmetics, and lotions, can cause both acne and a reduction in skin health
If the sentence is read without the modifier in between commas, the sentence implies that “facial pores” cause both acne and a reduction in skin health. That’s nonsensical meaning. The sentence intends to say that “covering skin pores” may have repercussions, but NOT skin pores themselves. Note that “both noun and noun” idiom is used correctly with two parallel nouns.
B. that masks, cosmetics, and lotions can, if facial pores are covered by them much of the time,
result in acne and a reduction in skin health
The difference between “cause” and “result in” is that, while concrete nouns can cause something, they cannot result in something. What can result in something is actions or events. For example “covering” is an action and this action can result in something whereas “masks” cannot do so.
Moreover, the modifier “if facial pores are covered by them much of the time” should precede “can”. In such case, this modifier could logically refer to “masks and other stuff”. However, as it’s written now, it doesn’t make sense.
C. that, in covering our facial pores much of the time with masks, cosmetics, and lotions, skin health can be reduced and acne can be caused
Because “preposition + ing” takes the following subject as its performer, this choice implies that “skin health covers our facial pore” – clearly nonsensical meaning.
D. that covering our facial pores much of the time with masks, cosmetics, and lotions can reduce skin health and cause acne
Bingo! Finally, a sound meaning: “covering our face with masks and other similar stuff may have repercussions.
E. that, in spending much of the time covered by masks, cosmetics, and lotions, facial pores can cause acne and a reduction in skin health
Ditto to A, E illogically implies that facial pores themselves deteriorate our skin. “in spending much of the time” refers to facial pores, and connotes that facial pores spend much of the time covered”.
Hence
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