Read the following excerpt from a US court opinion:
```
sentence” may not “then appeal the merits of a sentence conforming to the agreement.” United States v. Salcido-Contreras, 990 F.2d 51, 53 (2d Cir.1993). The plea agreement stipulated that Blackwell “committed the instant offense subsequent to sustaining one felony-conviction for a crime of violence.” App’x at 10, That stipulation resulted in a Guidelines range of 30 to 37 months under the terms of the plea agreement. Id. at 11. At sentencing, the district court decided to follow the plea agreement and sentenced Blackwell to 36 months imprisonment. Because Blackwell’s sentence conformed to his plea agreement, he received the benefit of that agreement and he has waived any challenge to his sentence on the basis of Johnson. See United States v. Morgan, 406 F.3d 135, 137 (2d Cir.2005) . For the foregoing reasons, and finding no
```
What is the most suitable continuation to the opinion? Your options are:
A. holding that defendants failure to appeal the voluntariness of a plea constitutes waiver of the issue on subsequent appeal
B. holding that a waiver of right to appeal contained in a plea agreement is enforceable
C. holding that the inability to foresee that subsequently decided cases would create new appeal issues does not supply a basis for failing to enforce an appeal waiver on the contrary the possibility of a favorable change in the law after a plea is simply one of the risks that accompanies pleas and plea agreements
D. holding that a failure to file an appeal is within the scope of the waiver because the failure does not undermine the validity of the plea or waiver
E. holding that since the statute does not provide for appeal of issues related to a motion to dismiss after entry of a guilty plea the defendant who raised only that issue had no right to appeal
Reply with [A, B, C, D, E] only.