Concerning these four sentences
A: Constructing a bridge is difficult.
B: The constructing of a bridge is difficult.
C: Construction of a bridge is difficult.
D: The construction of a bridge is difficult.
I think these four sentences are much the same, but there must be nuances of meaning.
Please tell me about them.
I think "The constructing of a bridge" in B and "The construction of a bridge" in D are a bit more conceptual than "Constructing a bridge" in A and "Construction of a bridge" in C.
Am I correct?
I think "Constructing a bridge" in A and "The constructing of a bridge" in B are a bit more likely (than "Construction of a bridge" in C and "The construction of a bridge" in D) to express the process of constructing such as designing, transporting building materials, noises of cranes and dump trucks, and fastening thing with bolts ---
Am I correct?