Which P-V graph shows an isochoric process

This type of question, asked 3 times: 10 May 2023 S1, 10 May 2024 S2, 18 Apr 2026 S1. All 3 questions below, oldest first.

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Question 1
10 May 2023 S1
30 $Which of the following graphs between pressure and volume correctly show isochoric process?$
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Question 2
10 May 2024 S2
42 $Which of the following graphs between pressure (p) and volume (V) correctly shows isochoric changes?$
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Question 3
18 Apr 2026 S1
116 $Which of the following graphs between pressure and volume of a gas correctly shows isochoric process in thermodynamics?$
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Question 1