Today’s saying 15: A still tongue makes a wise head
تا مرد سخن نگفته باشد / عیب و هنرش نهفته باشد
Possible interpretation: Someone who does not talk much, but listens to other people, probably has experience, knowledge and good judgement.
Note: still (adj.): not moving | tongue (noun): large, movable fleshy part in the mouth that we use for talking and tasting | wise (adj.): having experience, knowledge and good judgement
The answer is: b