If someone is known to have been dishonest about one thing, should we automatically be suspicious of his or her honesty regarding other things?

NO,  we should not be suspicious of their honesty concerning other things.

Explanation: When an individual has previously been dishonest, we should not be suspicious about their honesty regarding other things. Being suspicious about their honesty about other things can be said to be an adverse judgment formed without knowledge of the facts of the matter. This can be said to be prejudicial.

If and only if the individual has a habit of been dishonest serially, then it is safe to say that we can hold our suspicions. But an individual doing it for the first time can be given the benefit of doubt.

the 4th option is the answer

sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.