Recognizing the oscilloscope circuit symbol

Steps:

• Recall standard electronic component symbols used in circuit diagrams.
• Note that an oscilloscope displays voltage waveforms over time.
• Identify its unique symbol: a circle with a vertical line crossed by a short horizontal line on the right, mimicking a display screen.
• Compare to choices and select the matching one.

Why C is correct:

• C matches the IEC 60617 standard symbol for an oscilloscope, featuring a circular enclosure with an internal vertical line and adjacent short horizontal tick, representing the CRT screen.

Why the others are wrong:

• A is the voltmeter symbol (circle with "V" inside).
• B is the ammeter symbol (circle with "A" inside).
• D is the loudspeaker symbol (circle with diagonal lines).

Final answer: C