Why did Marco have to make a turn back?

Choices:
A. Because the author wanted to admire the hundreds of citrus trees
B. Because the author wanted to talk to the truck driver
C. not enough information
D. Because the author wanted to buy some kilos of clementines
Because the author wanted to buy some kilos of clementines
What would you do – you’re driving past hundreds of citrus trees. With a better look, they’re mandarins, or, more precisely clementines. On the roadside is a truck selling crates of them for 1 euro a kilo. You stop, right? And buy a crate of 10 kilos. Even though you have to get on a plane the next day.
I couldn’t help myself. Marco, who I had already made turn 180 degrees to drive back to the truck, gave me that look of disapproval when I want to do something totally unreasonable like impulse buy citrus fruit that we can’t keep. “What are we going to do with these?” He questioned. I wasn’t sure. I wanted to taste them, I wanted to photograph them. And maybe I could even squeeze some of them into our tiny bag to take home. “It won’t be a waste, I’ll give the rest away!” I reasoned.
He just shook his head, giving in. I bought them, a big grin on my face.
We were just outside the port city of Taranto, on the western coast of Puglia in Italy’s deep south, where we spent a long weekend recently and where clementines have special IGP (Protected Geographical Indication) status.
These clementines — a hybrid of oranges and mandarins — grow in the fertile soil around the gulf of Taranto, particularly around the town of Palagiano (also known as “the city of clementines” — they celebrate the symbol of their city with a sagra, a food festival, every December) and the delicate fruit is harvested by hand. We don’t get these in Florence, it was my only chance to taste them – they are small with very few, if any, seeds, and they are very sweet.