Why does Man want to go to other planets (1)the solar system? Justfor adventure?

Câu hỏi :

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.

      Why does Man want to go to other planets (1)                 the solar system? Justfor adventure? True, (2)            is adventure in space travel. But a (3) toother planets would also be (4)                    . For example, space stations could be built that would give us (5)                         information about the weather.

      In space stations (6)          around the earth, Man could live and study the cloud formation on (7)              surface. These formations could tell us what weather to(8)                     in any part of the world at any time. (9)        information wouldbe useful to pilots, to ship captains, and even to farmers (10)                 must setdates for planting and harvesting.

Why does Man want to go to other planets (1)                 the solar system? Justfor adventure?