Question 1:

Identify the invalid argument:

Explanation: The invalid argument is option B. The fact that the ground is wet does not necessarily mean that it rained, as there could be other reasons for the ground to be wet.

Question 2:

Identify the valid argument:

Explanation: The valid argument is option D. The premises state a general truth about triangles, and the conclusion follows logically based on the premises.

Question 3:

Identify the invalid argument:

Explanation: The invalid argument is option C. The conclusion does not follow logically from the premises because oranges and apples are distinct fruits.

Question 4:

Identify the valid argument:

Explanation: The valid argument is option A. The premises establish a general truth about mammals and dogs, and the conclusion logically follows from the premises.

Question 5:

Identify the invalid argument:

Explanation: The invalid argument is option B. The conclusion follows from the premise, but the premise itself is not a general truth about all elephants having trunks.