1. Correct Answer: Option B: I
 2. Explanation:
     To solve this problem, we need to understand the pattern of the sequence and determine the middle term.
     Step 1: Identify the Pattern
     The sequence is composed of letters from Z to A, with each letter appearing a number of times equal to its position in the reverse alphabet order.
         ○ Z appears 2 times.
         ○ Y appears 3 times.
         ○ X appears 4 times.
         ○ W appears 5 times.
         ○ V would appear 6 times, and so on, until A.
     Step 2: Calculate the Total Number of Terms
     The sequence continues until A, which would appear 26 times (since A is the 26th letter from Z in reverse order). The total number of terms in the sequence is the sum of the first 26 natural numbers:
     \[
     \text{Total terms} = 2 + 3 + 4 + \ldots + 26
     \]
     This is an arithmetic series where the first term \(a = 2\), the last term \(l = 26\), and the number of terms \(n = 25\) (since the sequence starts from 2, not 1).
     The sum of an arithmetic series is given by:
     \[
     S = \frac{n}{2} \times (a + l)
     \]
     Substituting the values:
     \[
     S = \frac{25}{2} \times (2 + 26) = \frac{25}{2} \times 28 = 25 \times 14 = 350
     \]
     So, there are 350 terms in total.
     Step 3: Find the Middle Term
     The middle term of the sequence is the 175th term (since 350/2 = 175).
     Step 4: Determine Which Letter Corresponds to the 175th Term
     We need to find out which letter corresponds to the 175th position:
         ○ Z: 2 terms (1 to 2)
         ○ Y: 3 terms (3 to 5)
         ○ X: 4 terms (6 to 9)
         ○ W: 5 terms (10 to 14)
         ○ V: 6 terms (15 to 20)
         ○ U: 7 terms (21 to 27)
         ○ T: 8 terms (28 to 35)
         ○ S: 9 terms (36 to 44)
         ○ R: 10 terms (45 to 54)
         ○ Q: 11 terms (55 to 65)
         ○ P: 12 terms (66 to 77)
         ○ O: 13 terms (78 to 90)
         ○ N: 14 terms (91 to 104)
         ○ M: 15 terms (105 to 119)
         ○ L: 16 terms (120 to 135)
         ○ K: 17 terms (136 to 152)
         ○ J: 18 terms (153 to 170)
         ○ I: 19 terms (171 to 189)
     The 175th term falls within the range of the letter I (171 to 189).
     Therefore, the middle term of the sequence is I.