Final answer:
Option 1 portrays John Messner as a reserved and mysterious individual, while option 4 reveals that he is kind and helpful despite his gruff exterior.
Step-by-step explanation:
The two sentences that best develop the character of John Messner are option 1: 'He was a reserved man, seldom speaking and with an air of mystery about him' and option 4: 'Despite his gruff exterior, he often went out of his way to help others in need.'
Option 1 portrays John Messner as a reserved and mysterious individual, suggesting that he is a man of few words. Option 4, on the other hand, reveals a different side of Messner, indicating that despite his gruff exterior, he is actually kind and helpful to others.