Your answer is correct.
Tomatoes are beneficial to health because they contain lycopene. Based on this assumption scientists have engineered a variety that contains more lycopene. The assumption is that when one consumes lycopene it is beneficial to health. Hence if a tomato contains more lycopene it is better.
Option 2 is not assumed by the scientists - their efforts are to make lycopene easily available.
Option 3 is also not assumed because we cannot say (there is no data) that the scientists chose tomatoes for this reason. For the same reason options 4 and 5 are also eliminated.
Hence, the correct answer is option 1.
