What actions by egypt in may 1967 did israel consider grounds for going to war

In May 1967, the Egyptian president Gamal Abdel Nasser announced to close all straits to Israel vessel and then the war broke out.

Explanation:

There was political tension that was existing from over a decade between the Israel and Egypt. But when the Egyptian president announced to close all the straits to Israel vessel, he mobilized a large number of militaries in the straits. After that, the Israel came up with yet another offensive step by launching air strike in Egypt. This series of incident was the major cause of Egypt- Israel war which lasted for six days but the casualties was too high.

The answer to that question is a