Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution’.
He was advised for walking alone in the neighbourhood.

The appropriate preposition depends on the negative or positive nature of the action. Walking alone in a neighbourhood can often be unsafe, so one is usually advised against it (meaning recommended not to do it).
"Advised for walking" is ungrammatical.

"Advised against doing something" means warning someone not to do that specific action.
Therefore, advised against is the perfect contextual fit.