Sentence 1: He is endeavouring to make out that there is quite as much evidence against Lawrence as against John "and I am not at all sure that he will not succeed." Detective-inspector Japp was the first witness called when the trial was reopened, and gave his evidence succinctly and briefly.

Sentence 2: He believed that both John and Lawrence were guilty.

(a). yes.
(b). it is not possible to tell.
(c). no.
Is this second sentence entailed by the first sentence?
(b).