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A : Telephone wires sag more in summer.
R : They expand due to summer heat.

A.Both A and R are true and R correctly explains A.
B.Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D.A is false but R is true.
Answer and Feedback
Answer:A
Feedback:Telphone wires expand in summer and the wire becomes loose. So, they sag

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