Final answer:
The correct word to fill in the blank is 'are.' This suits the subject 'Jordanians' and complements the adjective 'well-known'. Jordanians are known for their exceptional hospitality. The correct answer is option b. are.
Step-by-step explanation:
The correct answer for the sentence "Jordanians_____well-known for their hospitality" is b. are. This sentence requires the use of a verb to be that complements the subject 'Jordanians' and the adjective 'well-known'. 'Are' is the present tense plural form of the verb 'to be' that matches the plural subject 'Jordanians'.
Jordanians are renowned worldwide for their warm and welcoming nature towards guests and visitors, which is a defining characteristic of their culture.