Directions: The following items have four sentences, one of which...

The conjunction 'although' is used to introduce a subordinate clause that expresses a contrast. In standard English grammar, a main clause following an 'although' clause does not require an additional conjunction or adverb like 'still', 'yet', or 'even then'. These additions make the sentence redundant.

Therefore, the correct sentence is 'Although it was raining, we had the picnic.'

Answer: Although it was raining, we had the picnic.