$$7\frac{1}{7}$$ = $$\frac{50}{7}$$
$$3\frac{1}{14}$$=$$\frac{43}{14}$$
$$2\frac{2}{7}$$=$$\frac{16}{7}$$
Taking LCM of 7 and 14 the terms can be written as
$$\frac{100}{14}$$ - $$\frac{43}{14}$$ + $$\frac{32}{14}$$ = $$\frac{89}{14}$$
$$\frac{89}{14}$$=$$6\frac{5}{14}$$
Hence Option A is the correct answers.
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