The following sentence contains redundancies. It was $11$:$00$ p$.$m$.$ in the evening when we slowly inched our way forward, walking tentatively towards the looming, darkened tower on the hill above us$.$ Which of the following is the best revision of this sentence.

a$)$ It was a dark evening, $11$:$00,$ when we carefully, tentatively walked towards the darkened tower looming over us on the dark hill.

b$)$ At $11$:$00$ p$.$m$.$ we tentatively walked up the hill to the darkened tower on the rise above us as we inched our way forward.

c$)$ It was dark, $11$:$00$ p$.$m$.$ in fact, when we cautiously inched our way forward as we walked carefully up to the darkened tower on the hill above us$.$

d$)$ At $11$:$00$ p$.$m$.,$ we tentatively approached the darkened tower on the hill above us$.$