starting with a way of thinking across (26) communities, cultures, and ways of

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.
In recent years, the development of new technologies and the growth of social media sites have helped rapidly progress the global citizenship movement. The impact of this growing phenomenon on higher education is palpable, with more students than ever (23) ______ study abroad and strive to learn more about the world around them. (24) ______ the concept of global citizenship is not a new one, it is becoming ever more important in our expanding and increasingly interconnected world.
Though countless organizations and institutions of higher education cite global citizenship as one of their primary missions, it is imperative that we think about what this term really means. Global citizenship is (25) ______ of several elements, starting with a way of thinking across (26) ______ communities, cultures, and ways of life. While our national identities are assigned to us at birth, a global citizenship takes time to develop, and can only be attained through life experiences. Our interpretation of our experiences, as well as increasing self-awareness, ultimately shapes our ability to become global citizens. This may (27) ______ through a number of activities, from volunteer work in the community to traveling the world.