Let's simplify the expression step by step:
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The given expression is: \[ (1.3 \times 10^{-4}) + (3.52 \times 10^{-4}) - (1.02 \times 10^{-4}) \]
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Since all terms have the same power of 10, we can combine them directly: \[ 1.3 + 3.52 - 1.02 = 3.8 \]
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Now, we multiply the result by \(10^{-4}\): \[ 3.8 \times 10^{-4} \]
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To express this in decimal form, we move the decimal point in \(3.8\) four places to the left: \[ 3.8 \times 10^{-4} = 0.00038 \]
Thus, the value of the expression is \(0.00038\), which corresponds to option B.
Final Answer: B (0.00038)