In a sequence of numbers, if the first number is a positive integer an

Given: In a sequence of numbers, if the first number is a positive integer and if each number thereafter is the least prime number greater than the preceding number
Let's take a moment to understand what does sequence looks like.
The first term is ANY positive integer, and all terms after that are primes
For example one possible sequence could be {10, 11, 13, 17, 19, ....}
Another one could be: {3, 5, 7, 11, etc}

Target question: What is the value of the fifth number in the sequence?

Statement 1: The sum of the first two numbers in the sequence is equal to the third number in the sequence.
This statement is not sufficient. Consider these two possible cases:
Case a: The sequence is {1, 2, 3, 5, 7, ...}. This meets the condition that term3 = term1 + term2. In this case, the answer to the target question is term5 = 7
Case b: The sequence is {2, 3, 5, 7, 11, ...}. This meets the condition that term3 = term1 + term2. In this case, the answer to the target question is term5 = 11
Since we can’t answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: The sum of the third and fourth numbers in the sequence is 8.
We already know that term3 and term4 are PRIME numbers.
Since 3 and 5 are the ONLY prime numbers that add to 8, we can be certain that term3 = 3 and term4 = 5, which means term5 = 7 (since 7 is the next prime after 5)
Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Answer: B

Cheers,
Brent