The correct option is B.
The source of information, that would offer the most reliable fact-based information about the author is a book, that is written by the author himself. This type of source is called primary source. Information obtained from Wikipedia, movie and books published by other authors can only offer secondary information, which are not as reliable as information from primary source.
There are only three articles in the English language. One is definite, and two are indefinite. "The" is a definite article, while "a" and "an" are indefinite articles. To answer your question, you need to find the sentence that correctly uses "a" and "an". "A" is used if the word following it begins with a consonant, while "an" is used if the word following it begins with a vowel. Looking at the options provided in your particular problem, you can see that answer choice a is the only one that follows all of the above rules, making it the correct answer.
1b ) answer fertilization cause that's a sperm and egg cell
D. Would you be interested in a discount in exchange for filling out this survey?
