Post Let's remove the wrong ones first:

Let's remove the wrong ones first: 1. In English, any multiplier bigger than one must always make the next word plural with an "-s" (four bananas, four eights), so Option A (88889) is automatically out. 2. Now to the commas question. In formal written English, a list of single digits needs commas ("four, eight, one, and nine"). Why aren't there any? Because when we (humans) read 4-digit PIN or any code out loud (be it a phone number), our brain naturally group the digit into two or three pairs: [four eight] (48) and [one nine] (19). Because each pair is spoken as a single block, there is no comma between four and eight. 3. Speaking of "and", pay attention to the question, it uses the verb "has". When a verb connects two blocks in a sentence, English requires "and" between them (transitive verb grammar). 4. In linguistics, that word "and" acts like an equal sign (the law of parallelism): both sides must follow the exact same grammatical rule. 489 (D) breaks this rule (treating the left side as separate digits and right side as a multiplier), 888819 (C) does the exact opposite. So the correct answer is option B 4819, which follows all the rules above. @acceptthyself