Answer: option (D)
Explanation: In order to be a dissolve load of a stream, the particles must be of smaller size and less dense. Pebbles and cobbles are of size about 4-64 mm and 64-256 mm respectively
Sand grains are usually 0.125-2 mm in size but have a high average density
In case of minerals, it varies as some minerals are found to be bigger and some appears to be smaller in size. Minerals have the ability to get dissolved when undergoes chemical reactions.
Thus, the correct answer here is option(D) i.e. minerals which is most likely to be a part of the stream's dissolve load.