Table 18a 18.a -Refer to Table 18

Table 18.a
$$\begin{array}{l}\text { Table 18.a }\\\begin{array} { | l | c | } \hline \text { Current Account } & ( \$ ) \\\hline \text { Merchandise exports } & 500 \\\hline \text { Merchandise imports } & 200 \\\hline \text { Merchandise trade balance } & \\\hline \text { Service exports } & 400 \\\hline \text { Service imports } & 600 \\\hline \text { Goods and services balance } & \\\hline \text { Net investment income from abroad } & 50 \\\hline \text { Net unilateral transfers } & - 90 \\\hline \text { Current account balance } & \\\hline\end{array}\end{array}$$
-Refer to Table 18.a, which shows a balance-of-payments account. What is the merchandise trade balance?

A) $300
B) $100
C) ?-$300
D) ?$100
E) $60