11) The answer is (D)

A team undefeated after four rounds necessarily has an even score, but 6 is not acceptable since Marco's team must have won the first match, drawn the third, and lost at least one of the other two; 4, however, is possible if the results were $\mathrm{M}=\mathrm{VSPS}, \mathrm{R}=$ PPPP ( $\mathrm{V}=$ win, $\mathrm{S}=$ loss, $\mathrm{P}=$ draw $)$.
11) Marco says: "My team was ahead of yours in the standings for all the first three rounds, and only now at the fourth have you caught up with us".

Roberto replies: "But don't forget that at the third round we drew at your place and that, unlike you, we are still undefeated". How many points does each of the two teams have at the end of the fourth round? (3 points are awarded to the team that wins, 0 points to the one that loses, 1 point to each team in case of a draw).

$\begin{array}{lllll}\text { (A) } 7 & \text { (B) } 6 & \text { (C) } 5 & \text { (D) } 4 & \text { (E) the data is insufficient. }\end{array}$