On August $28,2023,$ Hershey, a US company, sold goods to a Italian Co$.$ at a price of Euro

$20,000$ when the direct exchange rate was IEuro $=$$$1\mathrm{.}80.$ The account has not been settled as

of December $31,2023,$ when the exchange rate was $1$ Euro $=$$$1\mathrm{.}90.$

a$.$ The Euro strengthened against the US Dollar.

b$.$ The Euro weakened against the US Dollar.

c$.$ The US Dollar strengthened against the Euro.

d$.$ The US Dollar weakened against the Euro.