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e-mail is usually a formal mode of business communication.
t f

False

Explanation:

Answer:

E-mail is usually a formal mode of business communication is a TRUE statement.

Explanation:

There can be two types of communication: formal or informal. Formal communication means a communication in an official way. It is controlled and takes place in an organisation through emails or by posting notices. Informal communication is mostly verbal between two people and is mostly casual.  

Email means transferring written messages via internet. Email is the formal way of business communication. We communicate a formal message through an email. It is documented and considered formal.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

you didn't list the options but im guessing it's resolving contradictions