Here the answer is B.

The answer is here explaining why B is the answer without mentioning why A is not correct.

I think A could be an answer too, am I right?

Here the answer is B.

The answer is here explaining why B is the answer without mentioning why A is not correct.

I think A could be an answer too, am I right?

If the bond pays coupons, then the expected return will depend on the rates at which those coupon payments can be reinvested. There’s no reason to expect that the reinvestment rates will average out to the bond’s YTM.