Choose the most appropriate option opposite in meaning to the word underlined wo...

This question is asking you to choose the option that has the opposite meaning to the underlined word "peripheral aspects". The sentence says "He devoted too much time to the peripheral aspects". Peripheral means something that is not essential or important. So, the question is asking you to choose the option that means important or essential.

The options are: A) unimportant, B) superficial, C) minor, and D) main. Option A means not important, option B means shallow or surface-level, and option C means small or not significant. Option D, which is the correct answer, means essential or important. So, the option that is opposite in meaning to peripheral, which means not important, is main, which means important or essential.

In summary, the correct answer to this question is option D, main, because it has the opposite meaning to the underlined word "peripheral", which means not important.