Multidisciplinary means something involving separate branches of learning and areas of expertise. That means two or more areas of knowledge may have the same subject under analysis, be it because they are complementary areas or simply to obtain a broader and more complete view of what is being studied. For instance, a native tribe of a South American country may be studied under the points of view of different sciences, such as sociology - for their human relationships - and linguistics - for the development of their writing system and the structure of their language.
The answer is B)<span>Walking is an easy and safe exercise for beginners. The paragraph is explaining that walking doesn't need much fancy equipment and that it is something easy for beginners.</span>
