The presence of which phenomenon proved the predictability of the big bang theory

C M B (Cosmic Microwave Background)

Explanation:

The theory of Big Bang suggests that matter of entire universe was converged at a single point thus, having infinite density. At time t = 0 (Big Bang), the universe started expanding.

This is no more a hypothesis but a theory because of the evidence provided by detection of C M B i.e. Cosmic microwave background. C M B is the remnant radiation of the Big Bang left over from about 400,000 years after the Big Bang. Before that the universe was opaque. C M B is present in all the directions and has an average temperature of 3 K. Thus, the detection of C M B led to proof of the Big Bang Theory.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.