In the following questions, a sentence is divided into four parts. Choose the part of the sentence which may contain a grammatical error in it. If all the parts of the sentence are Grammatically correct and contextually Meaningful, choose option “no error” as your answer choice. Symbolic diplomacy using national ceremonies is (a)/ relevant for countries that are keen for enhancing their global (b)/ image without using military power (c)/ or economic coercion as their only means.(d)

The error in the sentence is in (b): "relevant for countries that are keen for enhancing their global image." "Relevant for" is not typically used when referring to something being applicable to a group or category (in this case, countries). The correct preposition here is "relevant to", as "relevant to" is used to indicate that something pertains or is applicable to a particular group or situation. Additionally, "keen for enhancing" should be "keen on enhancing". The correct preposition with "keen" when expressing desire or interest in something is "keen on".