Correct Answer: Option B

Explanation

In the diagram:

<POR = 2 x 75 = 150º (< at centre = 2 x < at circumference)

<PSR = 180 - 75º = 105º

<ORS = 180 - 105º = 75º(adjacent <s)

y + 150º + 75º + 105º = 360º (sum of <s in a quadrilateral)

y = 360º - 330º = 30º

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