The correct option is B that success is attainable and we should be persistent
Option D: that success is attainable and we should be persistent.
As mentioned in this line, "We just need to be told that all things are possible if we try hard and
do not lose hope. Often success is lurking around the corner and if we
are persistent we find it at the end of our worst nightmares."
success is attainable "things are possible" and we should be persistent "if we are persistent we find it (success).
Hence option D is correct.
Option A: This isn't mentioned in the passage.
Options B and C: Similarly, these lines are also not mentioned in the passage. While facing challenges (in our efforts to look beyond our own troubles and shortcomings), the person does not want to know that his friends love him, or that life is difficult.
These are not motivational, as it should be, according to this line "all we need is a little support from family and friends."
Hence options A, B and C are incorrect.