Choose a subordinating conjunction to form complex sentence whereas although while as since after He was going to a birthday party. He wanted to bake a cake

whereas

Explanation:

The coordinating conjunctions join two parts of sentences. In this case, the conjunction shows the relationship between two sentences. In this case, we have two sentences or clauses:

So, the conjunction would effectively combine the two sentences here. The correct conjunction to use is whereas. This how the two events would occur at the same time.

d, unless i can just say all of them

not c