Francisco's orchard has apple trees, pear trees, orange trees, lemon trees, and tangerine trees, arranged in five parallel rows, each with a single variety of trees, as follows:

(a) the orange trees are next to the lemon trees;

(b) the pear trees are not next to the orange trees or the lemon trees;

(c) the apple trees are next to the pear trees, but not to the orange trees or the lemon trees.

In which row are the tangerine trees?
(a) $1 \underline{a}$
(b) $2^{\underline{a}}$
(c) $3^{a}$
(d) $4^{\mathrm{a}}$
(e) $5^{\underline{a}}$
The correct option is (c).

According to the data in the problem, we can observe that we have two pairs of neighboring trees: the orange trees are next to the lemon trees, and the apple trees are next to the pear trees. Since there are five rows and the apple and pear trees are not next to the orange and lemon trees, it follows that the tangerine trees are in the third row, the middle one.