Why does professor soames come to see sherlock holmes at the start of "the adventure of the three students"?

1 he thinks one of his students is trying to cheat on an important test.

2 he wants to see dr. watson, an old friend of his from their days in the army.

3 he believes that someone is planning to attack him.

4 he suspects that his trusted servant, mr. bannister, is stealing from him.

no links please! and if you answer it has to be right