Read the following excerpt from a US court opinion:
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property or the validity of the tax assessment, appellant chose to ignore the notice. This citation provided appellant all the notice to which it was entitled when it was originally served with process and gave appellant the opportunity to appear and defend the suit. We overrule appellant’s first point of error. Rule 2 instrument in writing, the damages shall be assessed by the court, or under its direction, unless the defendant demands and is entitled to a trial by jury. Tex.R.Civ.P. 241. A claim is liquidated if the amount of damages may be accurately calculated by the trial court from the factual, as opposed to the conclu-sory, allegations in plaintiffs petition and the instrument in writing. Novosad v. Cunningham, 38 S.W.3d 767, 773 (Tex.App.—Houston [14th Dist.] 2001, no pet. h.) ; Mantis v. Resz, 5 S.W.3d 388, 392
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What is the most suitable continuation to the opinion? Your options are:
A. holding that district courts order granting motion for default judgment was erroneous  because a default judgment cannot be entered until the amount of damages has been ascertained 
B. holding that no reporters record was required in suit to recover damages for breach of employment contract because the claim for damages was liquidated and proved by the employment contract attached to the petition
C. holding that suit to recover amount due for professional services was a liquidated claim proved by written instruments where plaintiff attached original invoices to verified petition and motion for default judgment
D. holding that a motion to dismiss or for summary judgment precluded default judgment
E. holding that a liquidated damages amount set by contract is enforceable where the amount bears a reasonable relation to the damages actually sustained
Reply with [A, B, C, D, E] only.