Option (1): 'Since there is no conjunction of contrast, a positive development should follow 'congenial journey'. 'Musty food' makes sense. So, (1) is incorrect.
Option (2): Since there is no conjunction of contrast, a positive development should follow 'congenial journey'. 'Congenial' and 'terrible' are almost antonymous.
Option (3): Since there is no conjunction of contrast, a positive development should follow 'congenial journey'. 'Palatable food' makes sense. The journey was good, and so was the food.
Option (4): Since there is no conjunction of contrast, a positive development should follow 'congenial journey'. 'Frightful food' makes no sense in context.
Option (5): 'Wholesome' appears quite close, but healthfulness of food is rather out of context. Nice journey, nice (palatable) food.