The sentences that correctly express the conditional mood are:
A. If we had left earlier, we would have arrived on time.
C. If the rain had stopped, you could have gone to the park.
These sentences depict unreal situations in the past that did not happen, using the third conditional form.
B. If Evan had called, we would make plans for later. (This should use "would have made" instead of "would make" to be correct.)
D. If the flowers are blooming, they would have smelled sweet. (This is incorrect because it mixes a present condition with a past result; it should use "they smell sweet" to express a current condition.)